"Alcohol is more dangerous than illegal drugs like heroin and crack cocaine, according to a new study. British experts evaluated substances including alcohol, cocaine, heroin, ecstasy and marijuana, ranking them based on how destructive they are to the individual who takes them and to society as a whole.
Researchers analyzed how addictive a drug is and how it harms the human body, in addition to other criteria like environmental damage caused by the drug, its role in breaking up families and its economic costs, such as health care, social services, and prison.
Heroin, crack cocaine and methamphetamine, or crystal meth, were the most lethal to individuals. When considering their wider social effects, alcohol, heroin and crack cocaine were the deadliest. But overall, alcohol outranked all other substances, followed by heroin and crack cocaine. Marijuana, ecstasy and LSD scored far lower (see chart above)."
Here's a link to the full text
of the article "Drug harms in the UK: a multicriteria decision analysis," and a summary of the key findings:
"Multicriteria decision analysis (MCDA) modeling showed that heroin, crack cocaine, and methamphetamine were the most harmful drugs to individuals (part scores 34, 37, and 32, respectively), whereas alcohol, heroin, and crack cocaine were the most harmful to others (46, 21, and 17, respectively). Overall, alcohol was the most harmful drug (overall harm score 72), with heroin (55) and crack cocaine (54) in second and third places (see chart above)."
Note: The first 21 comments below appeared following the original post in November 2010.