If I may interject:
We waste a lot of money on the enforcement of marijuana prohibition, even though most estimates say legality curbs usage by, in most generous studies, 3%. I got arrested for pot in NYC, half the people there were for pot, all the cases were thrown out, and it basically was just a waste of the time of the cops, the judge, and the marijuana enthusiast.
Beyond that, I feel that education about moderate use would do much better than simply telling "white lies" to scare kids from smoking pot. From my experience, a lot of kids who smoke pot say that it's harmless, usually upon realizing that pot doesn't cause things like increased chances of committing a violent crime, as one pamphlet I saw distributed at my college said. However, I feel that the problem becomes when a person smokes in disregard to responsibility. And heavy use does cause problems like bronchitis (my broker's lungs collapsed from smoking a pound a week a large portion of her life. She can't walk beyond the block where she lives/works).
TLDR: The money that could be spent on enforcing the prohibition of pot is better spend on educating people about it proper.
