For example, a slightly newer study http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2516340/
All good things, in moderation.
In Korea (where I live now), however, heavy-handed regulation aiming to make it "the most difficult place in the world to smoke" is probably going to curb rates quickly and dramatically: https://en.wikipedia.org/wiki/Smoking_in_South_Korea
Conversely, the trend with cannabis seems to be that the more the public learns about its effects on human health, the more use rises.
Why does there need to be a war in the first place?
Maybe in the upper classes. Vice taxes tend to hit the lower classes harder.
I'm all for regulation, but if an adult wants to smoke pot, I don't think there is a mandate to stop them.
Though, in fairness, it's not as big in the U.S. than in other countries.