Science lists the five most addictive drugs https://t.co/oQZPf3Ct8t pic.twitter.com/QHW12VCODa — The Conversation (@ConversationUK) March 3, 2016 1. Heroin Nutt et al.’s experts ranked heroin as the most addictive drug, giving it a score of 2.5 out of a maximum score of 3 2. Alcohol Although legal in the US andContinue Reading