Annual Causes of Death in the United States

Notice at the bottom of the chart, Cannabis with a Zero death!


Links for Data Tables:
AERS [FDA's Adverse Events Reporting System] Patient Outcomes by Year
Causes of Death
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1. (Annual Causes of Death, By Cause)
   

   Cause of death (Data from 2009 unless otherwise noted)1	Number
   All Causes	2,437,163
   Diseases of Heart	599,413
   Malignant Neoplasms	567,628
   Chronic Lower Respiratory Diseases	137,353
   Cerebrovascular Diseases	128,842
   Lack of Health Insurance3 (2005)	44,789
   Poisoning	41,592
   Drug-Induced2	39,147
   Intentional Self-Harm (Suicide)	36,909
   Septicemia	35,639
   Motor Vehicle Accidents	34,485
   Firearm Injuries	31,347
   Alcohol-Induced	24,518
   Illicit Drugs (2000)	17,0004
   Homicide	16,799
   Human Immunodeficiency Virus (HIV)	9,406
   Viral hepatitis	7,694
   Cannabis (Marijuana)	0

   
   ^{1 Based on the International Classification of Diseases, Tenth Revision, Second Edition, 2004, except for "lack of health insurance" and "cannabis"
   2 "Drug induced" include both legal and illicit drugs.
   3 Wilper, Andrew P., et al., "Health Insurance and Mortality in US Adults," American Journal of Public Health (Washington, DC: American Public Health Association, December 2009), Vol. 99, No. 12
   4 Mokdad, Ali H., PhD, James S. Marks, MD, MPH, Donna F. Stroup, PhD, MSc, Julie L. Gerberding, MD, MPH, "Actual Causes of Death in the United States, 2000," Journal of the American Medical Association, (March 10, 2004), G225 Vol. 291, No. 10, 1242.}
   

   Source:

   Kenneth D. Kochanek, M.A.; Jiaquan Xu, M.D.; Sherry L. Murphy, B.S.; Arialdi M. Minino, M.P.H.; and Hsiang-Ching Kung, Ph.D., "Deaths: Final Data for 2009," Division of Vital Statistics (Atlanta, GA: Centers for Disease Control), Vol. 60, Number 3, Dec. 29, 2011
   http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf
   Wilper, Andrew P.; Woolhandler, Steffie; Lasser, Karen E.; McCormick, Danny; Bor, David H.; & Himmelstein, David U., "Health Insurance and Mortality in US Adults," American Journal of Public Health (Washington, DC: American Public Health Association, December 2009), Vol. 99, No. 12
   http://www.pnhp.org/excessdeaths/health-insurance-and-mortality-in-US-ad...



2. Basic Data

   
   (Opioid Deaths) "From 1999 to 2007, the number of U.S. poisoning deaths involving any opioid analgesic (e.g., oxycodone, methadone, or hydrocodone) more than tripled, from 4,041 to 14,459, or 36% of the 40,059 total poisoning deaths in 2007. In 1999, opioid analgesics were involved in 20% of the 19,741 poisoning deaths. During 1999–2007, the number of poisoning deaths involving specified drugs other than opioid analgesics increased from 9,262 to 12,790, and the number involving nonspecified drugs increased from 3,608 to 8,947."
   

   Source:

   "Number of Poisoning Deaths* Involving Opioid Analgesics and Other Drugs or Substances — United States, 1999–2007," Morbidity and Mortality Weekly Report, August 20, 2010, Vol. 59, No. 32 (Atlanta, GA: US Centers for Disease Control), p. 1026.
   http://www.cdc.gov/mmwr/pdf/wk/mm5932.pdf


3. (Opiate Pain Reliever OD Deaths) "During 1999–2008, overdose death rates, sales, and substance abuse treatment admissions related to OPR increased in parallel (Figure 2). The overdose death rate in 2008 was nearly four times the rate in 1999. Sales of OPR in 2010 were four times those in 1999."
   

   Source:

   Centers for Disease Control and Prevention, "Vital Signs: Overdoses of Prescription Opioid Pain Relievers — United States, 1999–2008," Morbidity and Mortality Weekly Report (Atlanta, GA: 2011), Vol. 60, No. 43, p. 1488.
   http://www.cdc.gov/mmwr/pdf/wk/mm6043.pdf


4. (Prescription Drug ODs) "In 2008, a total of 36,450 deaths were attributed to drug overdose, a rate of 11.9 per 100,000 population (Table 1), among which a drug was specified in 27,153 (74.5%) deaths. One or more prescription drugs were involved in 20,044 (73.8%) of the 27,153 deaths, and OPR were involved in 14,800 (73.8%) of the 20,044 prescription drug overdose deaths."
   

   Source:

   Centers for Disease Control and Prevention, "Vital Signs: Overdoses of Prescription Opioid Pain Relievers — United States, 1999–2008," Morbidity and Mortality Weekly Report (Atlanta, GA: 2011), Vol. 60, No. 43, p. 1488.
   http://www.cdc.gov/mmwr/pdf/wk/mm6043.pdf


5. (Mortality and IDU, Worldwide 2010) "It is also estimated that there were between 99,000 and 253,000 deaths globally in 2010 as a result of illicit drug use, with drug-related deaths accounting for between 0.5 and 1.3 per cent of all-cause mortality among those aged 15-64.1 Moreover, it was estimated that in 2008 there were 16 million injecting drug users worldwide and that 3 million (18.9 per cent) of them were living with HIV, though no new figures are available after 2008. Global prevalence of hepatitis C infection among injecting drug users in 2010 was 46.7 per cent, meaning that some 7.4 million injecting drug users worldwide are infected with hepatitis C. And some 2.3 million injecting drug users are infected with hepatitis B. Evidence is also emerging that non-injecting drug use is also associated with an increased risk of HIV infection, principally due to unprotected sex."
   

   Source:

   UN Office on Drugs and Crime, World Drug Report 2012 (United Nations publication, Sales No. E.12.XI.1), p. 7.
   https://www.unodc.org/documents/data-and-analysis/WDR2012/WDR_2012_web_s...


6. (Marijuana Mortality) "Indeed, epidemiological data indicate that in the general population marijuana use is not associated with increased mortality."
   

   Source:

   Janet E. Joy, Stanley J. Watson, Jr., and John A Benson, Jr., "Marijuana and Medicine: Assessing the Science Base," Division of Neuroscience and Behavioral Research, Institute of Medicine (Washington, DC: National Academy Press, 1999), p. 109.
   http://www.nap.edu/openbook.php?isbn=0309071550&page=109


7. (Alcohol Mortality) "Excessive alcohol use* accounted for an estimated average of 80,000 deaths and 2.3 million years of potential life lost (YPLL) in the United States each year during 2001–2005, and an estimated $223.5 billion in economic costs in 2006. Binge drinking accounted for more than half of those deaths, two thirds of the YPLL, and three quarters of the economic costs."
   * Excessive alcohol use includes binge drinking (defined by CDC as consuming four or more drinks per occasion for women or five or more drinks per occasion for men), heavy drinking (defined as consuming more than one drink per day on average for women or more than two drinks per day on average for men), any alcohol consumption by pregnant women, and any alcohol consumption by youths aged less than 21 years.
   

   Source:

   Kanny, Dafna; Garvin, William S.; and Balluz, Lina, "ital Signs: Binge Drinking Prevalence, Frequency, and Intensity Among Adults — United States, 2010," Morbidity and Mortality Weekly Report (Atlanta, GA: Centers for Disease Control and Prevention, January 13, 2012) Vol. 61, No. 1, p. 14.
   http://www.cdc.gov/mmwr/pdf/wk/mm6101.pdf


8. (Alcohol Mortality 2009) "In 2009, a total of 24,518 persons died of alcohol-induced causes in the United States (Tables 10, 12, and 13). This category includes deaths from dependent and nondependent use of alcohol, and also includes accidental poisoning by alcohol. It excludes unintentional injuries, homicides, and other causes indirectly related to alcohol use, as well as deaths due to fetal alcohol syndrome (for a list of alcohol-induced causes, see ‘‘Technical Notes’’).
   "In 2009, the age-adjusted death rate for alcohol-induced causes for males was three times the rate for females. Compared with the rate for the white population, the rate for the black population was 19.5% lower.
   "There was no change the age-adjusted death rate for alcohol-induced causes for the total population from 2008 to 2009. The age-adjusted death rate decreased 2.6% for non-Hispanic white males. The rate increased 7.9% for non-Hispanic white females."
   

   Source:

   Kenneth D. Kochanek, M.A.; Jiaquan Xu, M.D.; Sherry L. Murphy, B.S.; Arialdi M. Minino, M.P.H.; and Hsiang-Ching Kung, Ph.D., "Deaths: Final Data for 2009," Division of Vital Statistics (Atlanta, GA: Centers for Disease Control), Vol. 60, Number 3, Dec. 29, 2011, p. 11.
   http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf


9. (Suicide, 2009) The US Centers for Disease Control reports that in 2009, there were a total of 36,909 deaths from suicide in the US.
   

   Source:

   Kenneth D. Kochanek, M.A.; Jiaquan Xu, M.D.; Sherry L. Murphy, B.S.; Arialdi M. Minino, M.P.H.; and Hsiang-Ching Kung, Ph.D., "Deaths: Final Data for 2009," Division of Vital Statistics (Atlanta, GA: Centers for Disease Control), Vol. 60, Number 3, Dec. 29, 2011, Table B, p. 5.
   http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf


10. (Drug-Induced, 2009) "In 2009, a total of 39,147 persons died of drug-induced causes in the United States (Tables 10, 12, and 13). This category includes deaths from poisoning and medical conditions caused by dependent and nondependent use of legal or illegal drugs, and also includes poisoning from medically prescribed and other drugs. It excludes unintentional injuries, homicides, and other causes indirectly related to drug use, as well as newborn deaths due to the mother’s drug use. (For a list of drug-induced causes, see ‘‘Technical Notes.’’ See also the discussion of poisoning mortality that uses the more narrow definition of poisoning as an injury in the section titled ‘‘Injury mortality by mechanism and intent’’.)
    "For males in 2009, the age-adjusted death rate for drug-induced causes was 1.6 times the rate for females. The age-adjusted death rate for black females was 40.2% lower than the rate for white females, and the rate for black males was 24.7% lower than the rate for white males.
    "In 2009, the age-adjusted death rate for drug-induced causes for the U.S. population remained unchanged from 2008 (12.6). Among the major race-sex and race-ethnicity-sex groups during the same period, the age-adjusted death rate for drug-induced causes increased only for API males 29.2%. All other major race-sex and race-ethnicity-sex groups showed no changes in 2009 from 2008."
    

    Source:

    Kenneth D. Kochanek, M.A.; Jiaquan Xu, M.D.; Sherry L. Murphy, B.S.; Arialdi M. Minino, M.P.H.; and Hsiang-Ching Kung, Ph.D., "Deaths: Final Data for 2009," Division of Vital Statistics (Atlanta, GA: Centers for Disease Control), Vol. 60, Number 3, Dec. 29, 2011, p. 11.
    http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf


11. (Homicides, 2009) The US Centers for Disease Control reports that in 2009, there were a total of 16,799 deaths from homicide in the US.
    

    Source:

    Kenneth D. Kochanek, M.A.; Jiaquan Xu, M.D.; Sherry L. Murphy, B.S.; Arialdi M. Minino, M.P.H.; and Hsiang-Ching Kung, Ph.D., "Deaths: Final Data for 2009," Division of Vital Statistics (Atlanta, GA: Centers for Disease Control), Vol. 60, Number 3, Dec. 29, 2011, Table B, p. 5.
    http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf


12. (Leading Causes of Death by Race/Ethnicity, 2008) The Centers for Disease Control reported that in 2008, HIV disease was the 25th leading cause of death in the US for non-Hispanic whites, the 10th leading cause of death for non-Hispanic blacks, and the 17th leading cause of death for Hispanics.
    

    Source:

    Heron, Melonie P., PhD, "Deaths: Leading Causes for 2008," National Vital Statistics Reports, Vol. 60, No. 6 (Hyattsville, MD: National Center for Health Statistics, June 6, 2012), p. 12, Table E.
    http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_06.pdf


13. (Deaths and Serious Patient Outcomes from FDA-Approved Drugs) "These data describe the outcome of the patient as defined in U.S. reporting regulations (21 CFR 310.305, 314.80, 314.98, 600.80) and Forms FDA 3500 and 3500A (the MedWatch forms). Serious means that one or more of the following outcomes were documented in the report: death, hospitalization, life-threatening, disability, congenital anomaly and/or other serious outcome. Documenting one or more of these outcomes in a report does not necessarily mean that the suspect product(s) named in the report was the cause of these outcomes."
    

    AERS1 Patient Outcomes by Year
    Year	Death	Serious
    2000	19,445	153,818
    2001	23,988	166,384
    2002	28,181	159,000
    2003	35,173	177,008
    2004	34,928	199,510
    2005	40,238	257,604
    2006	37,465	265,130
    2007	36,834	273,276
    2008	49,958	319,741
    2009	63,846	373,535
    2010	82,724	471,291
    Total 2000-2010	452,780	2,816,297
    Total 2001-2005	162,508	959,506
    Total 2006-2010	270,827	1,702,973
    % Chg	+66.7%	+77.5%

    
    
    ^{1 AERS = Adverse Events Reporting System. This system managed by the US Food and Drug Administration (FDA) contains over four million reports of adverse events and reflects data from 1969 to the present. Data from AERS are presented as summary statistics. These summary statistics cover data received over the last ten years. These data are presented at the individual report level; some of the numbers may reflect duplicate reporting due to factors such as follow-up reports received on a case or different persons reporting on the same patient case.}
    

    Source:

    "AERS Patient Outcomes by Year," Food and Drug Administration (Washington, DC: U.S. Department of Health and Human Services, March 31, 2010).
    http://www.fda.gov/Drugs/GuidanceComplianceRegulatoryInformation/Surveil...


14. (Illicit Drug Use) "Illicit drug use is associated with suicide, homicide, motor-vehicle injury, HIV infection, pneumonia, violence, mental illness, and hepatitis. An estimated 3 million individuals in the United States have serious drug problems. Several studies have reported an undercount of the number of deaths attributed to drugs by vital statistics; however, improved medical treatments have reduced mortality from many diseases associated with illicit drug use. In keeping with the report by McGinnis and Foege, we included deaths caused indirectly by illicit drug use in this category. We used attributable fractions to compute the number of deaths due to illicit drug use. Overall, we estimate that illicit drug use resulted in approximately 17000 deaths in 2000, a reduction of 3000 deaths from the 1990 report."
    

    Source:

    Mokdad, Ali H., PhD, James S. Marks, MD, MPH, Donna F. Stroup, PhD, MSc, Julie L. Gerberding, MD, MPH, "Actual Causes of Death in the United States, 2000," Journal of the American Medical Association, (March 10, 2004), G225 Vol. 291, No. 10, 1242.
    http://www.csdp.org/research/1238.pdf


15. (Homicide Rates - International Comparisons, 2010) "The homicide rate in the Americas is, at 15.6 per 100,000, more than double the world average (figure 1.3), while, at 17.4 per 100,000, Africa has the highest rate among all regions, although it also has the largest uncertainty range due to large discrepancies between criminal justice and public health data.4 Asia falls between 2.4 and 4.3 per 100,000, and both Europe and Oceania also fall below the global average at 3.5 per 100,000, respectively."
    

    Source:

    UN Office on Drugs and Crime, "2011 Global Study on Homicide," 2011, p. 21.
    http://www.unodc.org/documents/data-and-analysis/statistics/Homicide/Glo...


16. (Leading Causes of Death 2000) "The leading causes of death in 2000 were tobacco (435,000 deaths; 18.1% of total US deaths), poor diet and physical inactivity (400,000 deaths; 16.6%), and alcohol consumption (85,000 deaths; 3.5%). Other actual causes of death were microbial agents (75,000), toxic agents (55,000), motor vehicle crashes (43,000), incidents involving firearms (29,000), sexual behaviors (20,000), and illicit use of drugs (17,000)."
    Note: According to a correction published by the Journal on January 19, 2005, "On page 1240, in Table 2, '400,000 (16.6)' deaths for 'poor diet and physical inactivity' in 2000 should be '365,000 (15.2).' A dagger symbol should be added to 'alcohol consumption' in the body of the table and a dagger footnote should be added with 'in 1990 data, deaths from alcohol-related crashes are included in alcohol consumption deaths, but not in motor vehicle deaths. In 2000 data, 16,653 deaths from alcohol-related crashes are included in both alcohol consumption and motor vehicle death categories."
    

    Source:

    Mokdad, Ali H., PhD, James S. Marks, MD, MPH, Donna F. Stroup, PhD, MSc, Julie L. Gerberding, MD, MPH, "Actual Causes of Death in the United States, 2000," Journal of the American Medical Association, (March 10, 2004), G225 Vol. 291, No. 10, p. 1238, 1240.
    http://proxy.baremetal.com/csdp.org/research/1238.pdf
    Source for Correction: Journal of the American Medical Association, Jan. 19, 2005, Vol. 293, No. 3, p. 298.


17. (Adverse Drug Reactions) "Adverse drug reactions are a significant public health problem in our health care system. For the 12,261,737 Medicare patients admitted to U.S. hospitals, ADRs were projected to cause the following increases: 2976 deaths, 118,200 patient-days, $516,034,829 in total charges, $37,611,868 in drug charges, and $9,456,698 in laboratory charges. If all Medicare patients were considered, these figures would be 3 times greater."
    

    Source:

    C. A. Bond, PharmD, FASHP, FCCP, and Cynthia L. Raehl, PharmD, FASHP, FCCP, Department of Pharmacy Practice, School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, "Adverse Drug Reactions in United States Hospitals" Pharmacotherapy, 2006;26(5):601-608.
    http://www.ncbi.nlm.nih.gov/pubmed/16637789


18. (Adverse Drug Reaction Deaths) "Our study revealed that experiencing an ADR [Adverse Drug Reaction] while hospitalized substantially increased the risk of death (1971 excess deaths, OR 1.208, 95% CI 1.184-1.234). This finding reflects about a 20% increase in mortality associated with an ADR in hospitalized patients. Extrapolating this finding to all patients suggests that 2976 Medicare patients/year and 8336 total patients/year die in U.S. hospitals as a direct result of ADRs; this translates to approximately 1.5 patients/hospital/year."
    

    Source:

    C. A. Bond, PharmD, FASHP, FCCP and Cynthia L. Raehl, PharmD, FASHP, FCCP, "Adverse Drug Reactions in United States Hospitals," Pharmacotherapy, 2006;26(5):601-608.
    http://www.medscape.com/viewarticle/531809


19. (Marijuana Safety - DEA Administrative Law Judge's Ruling)
    "3. The most obvious concern when dealing with drug safety is the possibility of lethal effects. Can the drug cause death?
    "4. Nearly all medicines have toxic, potentially lethal effects. But marijuana is not such a substance. There is no record in the extensive medical literature describing a proven, documented cannabis-induced fatality.
    "5. This is a remarkable statement. First, the record on marijuana encompasses 5,000 years of human experience. Second, marijuana is now used daily by enormous numbers of people throughout the world. Estimates suggest that from twenty million to fifty million Americans routinely, albeit illegally, smoke marijuana without the benefit of direct medical supervision. Yet, despite this long history of use and the extraordinarily high numbers of social smokers, there are simply no credible medical reports to suggest that consuming marijuana has caused a single death.
    "6. By contrast aspirin, a commonly used, over-the-counter medicine, causes hundreds of deaths each year.
    "7. Drugs used in medicine are routinely given what is called an LD-50. The LD-50 rating indicates at what dosage fifty percent of test animals receiving a drug will die as a result of drug induced toxicity. A number of researchers have attempted to determine marijuana's LD-50 rating in test animals, without success. Simply stated, researchers have been unable to give animals enough marijuana to induce death.
    "8. At present it is estimated that marijuana's LD-50 is around 1:20,000 or 1:40,000. In layman terms this means that in order to induce death a marijuana smoker would have to consume 20,000 to 40,000 times as much marijuana as is contained in one marijuana cigarette. NIDA-supplied marijuana cigarettes weigh approximately .9 grams. A smoker would theoretically have to consume nearly 1,500 pounds of marijuana within about fifteen minutes to induce a lethal response.
    "9. In practical terms, marijuana cannot induce a lethal response as a result of drug-related toxicity."
    

    Source:

    US Department of Justice, Drug Enforcement Administration, "In the Matter of Marijuana Rescheduling Petition" (Docket #86-22), September 6, 1988, p. 56-57.
    http://druglibrary.net/olsen/MEDICAL/YOUNG/young4.html


20. (Dangers of New Prescription Drugs) "Each year offers new examples of injuries and deaths caused by untoward dangers in prescription drugs. Prominent illustrations from recent years include Vioxx, a popular arthritis painkiller that more than doubled the risk of heart attacks and strokes,⁶ a risk that lingered long after users stopped taking the drug;⁷ “Phen-fen,” a diet drug that caused heart damage;⁸ and Propulsid, a drug that reduced gastric acid but also threatened patients’ hearts.⁹ Once information on these side-effects became known to the public, the manufacturers of each of these drugs stopped selling them and, eventually, paid millions or billions of dollars to settle claims for resulting injuries.¹⁰ Merck, for example, having withdrawn the profitable Vioxx drug¹¹ from the market in 2004, settled nearly 50,000 Vioxx cases in late 2007 for $4.85 billion.¹² In 2009, Eli Lilly agreed to plead guilty and pay $1.415 billion in criminal and civil penalties for promoting its antipsychotic drug, Zyprexa, as suitable for uses not approved by the Food and Drug Administration (“FDA”).¹³ These cases may be among the more prominent, but they represent just the tip of the iceberg of damage caused by prescription drugs."
    

    Source:

    Owen, David G., "Dangers in Prescription Drugs: Filling a Private Law Gap in the Healthcare Debate," Connecticut Law Review (Hartford, CT: University of Connecticut School of Law, February 2010) Volume 42, Number 3, p. 737.
    http://uconn.lawreviewnetwork.com/files/documents/DavidG.Owen-DangersinP...


21. (Acetaminophen-Related Liver Injury)
    "... acetaminophen-related liver injury led to approximately
    • 56,000 emergency department visits (1993–1999),
    • 26,000 hospitalizations (1990–1999), and
    • 458 deaths (1996–1998).
    "Of these cases, unintentional acetaminophen overdose was associated with
    • 13,000 emergency department visits (1993–1999),
    • 2189 hospitalizations (1990–1999), and
    • 100 deaths (1996–1998) (71 FR 77314 at 77318)."
    

    Source:

    Federal Register, "Organ-Specific Warnings; Internal Analgesic, Antipyretic, and Antirheumatic Drug Products for Over-the-Counter Human Use; Final Monograph," Vol. 74, No. 81, Wednesday, April 29, 2009, p. 19385.
    http://edocket.access.gpo.gov/2009/pdf/E9-9684.pdf


22. (NSAIDS) "Each year, use of NSAIDs (Non-Steroidal Anti-Inflammatory Drugs) accounts for an estimated 7,600 deaths and 76,000 hospitalizations in the United States." (NSAIDs include aspirin, ibuprofen, naproxen, diclofenac, ketoprofen, and tiaprofenic acid.)
    

    Source:

    Robyn Tamblyn, PhD; Laeora Berkson, MD, MHPE, FRCPC; W. Dale Jauphinee, MD, FRCPC; David Gayton, MD, PhD, FRCPC; Roland Grad, MD, MSc; Allen Huang, MD, FRCPC; Lisa Isaac, PhD; Peter McLeod, MD, FRCPC; and Linda Snell, MD, MHPE, FRCPC, "Unnecessary Prescribing of NSAIDs and the Management of NSAID-Related Gastropathy in Medical Practice," Annals of Internal Medicine (Washington, DC: American College of Physicians, 1997), September 15, 1997, 127:429-438.
    http://www.annals.org/content/127/6/429.full.pdf
    Citing: Fries, JF, "Assessing and understanding patient risk," Scandinavian Journal of Rheumatology Supplement, 1992;92:21-4.


23. (Lethal Dose by Substance) "The most toxic recreational drugs, such as GHB (gamma-hydroxybutyrate) and heroin, have a lethal dose less than 10 times their typical effective dose. The largest cluster of substances has a lethal dose that is 10 to 20 times the effective dose: These include cocaine, MDMA (methylenedioxymethamphetamine, often called “ecstasy”) and alcohol. A less toxic group of substances, requiring 20 to 80 times the effective dose to cause death, include Rohypnol (flunitrazepam or “roofies”) and mescaline (peyote cactus). The least physiologically toxic substances, those requiring 100 to 1,000 times the effective dose to cause death, include psilocybin mushrooms and marijuana, when ingested. I’ve found no published cases in the English language that document deaths from smoked marijuana, so the actual lethal dose is a mystery."
    

    Source:

    Gable, Robert S., "The Toxicity of Recreational Drugs," American Scientist (Research Triangle Park, NC: Sigma Xi, The Scientific Research Society, May-June 2006) Vol. 94, No. 3, p. 207.
    http://www.americanscientist.org/libraries/documents/200645104835_307.pd...