According to this chart, heroin is both the most addictive and most harmful drug. On the dependence scale, the three most addicting drugs are heroin (#1), cocaine (#2) and tobacco (#3).
Update: As Colin points out in the comments, tobacco is both more addictive and more harmful than cannabis, and yet tobacco is legal and marijuana is illegal?
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→Next to Heroin & Cocaine, Tobacco Most Addictive
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→https://manufacturing-holdings.blogspot.com/2009/05/next-to-heroin-cocaine-tobacco-most.html
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