Professor David Nutt is calling for a new 'index of harm' to warn the public about the relative dangers of various substances.
He says alcohol should rank fifth, behind only cocaine, heroin, barbiturates and methadone, while tobacco should rank ninth, ahead of cannabis, LSD and Ecstasy.
His comments are likely to prove explosive, given the seniority of his position. Professor Nutt has also courted controversy in the past - by suggesting taking ecstasy was no more dangerous than riding a horse."
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