Comment by Mark Kleiman

 I agree. The problems we see with heroin and cocaine are the problems of
 prohibition: a relatively small humber of users doing themselves and those
 around them an enormous amount of harm. We don’t see the problems
 prohibition prevents — a much larger number of users, suffering and doing
 less harm per user but perhaps more aggregate harm — unless we look at
 alcohol and nicotine.

 Until someone is prepared to specify an alternative policy — a
 post-prohibition regime — the critique of prohibition is open to the
Barlowquestion “Compared to what?” Air pollution is a serious problem, but
 breathing vacuum is not a good alternative.

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