An exhaustive search of the literature finds no deaths induced by marijuana. The US Drug Abuse Warning Network (DAWN) records instances of drug mentions in medical examiners' reports, and though marijuana is mentioned, it is usually in combination with alcohol or other drugs. Marijuana alone has not been shown to cause an overdose death.
Source: Drug Abuse Warning Network (DAWN), available on the web at
http://www.samhsa.gov/; also see 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), available on the web at
http://www.nap.edu/html/marimed/; and US Department of Justice, Drug Enforcement Administration, "In the Matter of Marijuana Rescheduling Petition" (Docket #86-22), September 6, 1988, p. 57.
There are not a lot of substances that you can say that about.
The DEA's Administrative Law Judge, Francis Young concluded: "In strict medical terms marijuana is far safer than many foods we commonly consume. For example, eating 10 raw potatoes can result in a toxic response. By comparison, it is physically impossible to eat enough marijuana to induce death. Marijuana in its natural form is one of the safest therapeutically active substances known to man.
What are these terrible dangers you allude to?
For example, eating 10 raw potatoes can result in a toxic response. The difference is that those 10 potatoes don't adversely affect a person's mental abilities, as does marijuana, nor do they lead to addiction and possible introduction to harder drugs, as does marijuana.