Professor Roger Roffman, an expert on addictive disorders, was one of the leading figures in the campaign, and he had been campaigning for marijuana legalization since 1967, ever since he returned from Vietnam. But when he heard people during the campaign saying the drug is “safe,” he felt obliged to explain: “This is perhaps what you’d like to believe, but the science doesn’t support it. Dependence is a risk. Driving accidents are a risk. Teenagers using marijuana early and regularly and becoming derailed . . . is a risk, and to say marijuana is harmless is misinformed, and it’s misinforming
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