Comment by Mark Kleiman

 John misses the flip side of his point here that the damage done by
 prohibited drugs is partly a function of prohibition. By the same token,
 the damage done by legal drugs is partly a function of legality, and the
 resulting interpenetration of drug use, commerce, and day-to-day social
 interaction. Nicotine kills many people because it is widely used, and
 because it is marketed in its most deadly form: cigarettes.

 When John says: "I seriously doubt that if a quarter of the American
 population used legal heroin that the mortality rate from it would be any
 perceptible fraction of that," I agree. But the the number of corpses is
 not the only measure of drug-related damage. The misery of heroin
 addiction is of a different kind than the mortality of cigarette smoking,
 but if I had to choose a habit for myself or a friend, I'd certainly choose
 nicotine over heroin. Wouldn't you?

 Where John says:

 "Of course, there would be social and economic consequences of having a
 quarter of the population on the nod, but I think they would be balanced by
 taking that same quarter off the more socially disastrous legal sedative,
 alcohol."

 He assumes that heroin and alcohol are substitutes in the economic sense.
 That may be the case for heroin. It certainly isn't the case for cocaine,
 which is strongly complementary with alcohol. (That's part of the problem
 in measuring fetal damage from cocaine: it's hard to tell how much ought
 to be attributed to the alcohol the mothers drank.)

 The relevant statistic, surely, isn't total damage but damage per dose or
 per heavy user. It's not surprising that 10 million problem drinkers rack
 up more total violence than 2 or 2.5 million heavy cocaine users. If
 alcohol were made illegal again, the violence associated with drinking
 would decrease, while violence associated with alcohol dealing would come
 back into being.

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