A reader writes:
In the item "Debating a Bud", you quote Harvard economics Jeffrey A. Miron as saying, "One thing legalization would not do is produce a major increase in marijuana use; existing evidence suggests prohibition has only a modest impact. Alcohol consumption declined moderately but not dramatically during alcohol prohibition, for example."
Per capita consumption of alcohol in the U.S. in 1934, the first year after Prohibition was repealed, was at half of the level before the first of the state prohibition laws was enacted in 1906 (federal in 1919). And it did not return to pre-prohibition levels until the early 1970s. Miron himself published this data! He states, "The evidence on alcohol consumption during Prohibition is incomplete," but look at Figure 1 in his study and make up your own mind.