Alcohol
MCDA (multi-criteria decision analysis) modelling 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. Drug harms in the UK: a multicriteria decision analysis, Prof David J Nutt, FMedSci; Leslie A King, PhD; Lawrence D Phillips, PhD
...traditional drugs of abuse, i.e., cocaine (including “crack”), methamphetamine, heroin, and alcohol were ranked as being most harmful. Ranking the Harm of Psychoactive Drugs Including Prescription Analgesics to Users and Others–A Perspective of German Addiction Medicine Experts