That'll be fewer...
However, people who smoke or drink are less likely to cause harm to others, ie some unfortunately addicted drug users will rob, steal, mug or kill to fuel their addiction...but I agree, it does seem to be a question of degree.
I know, i KNOW...passive smoking and damage caused by alcoholism...like I said, it's a question of degree...
Also, we are used to paying tax on alcohol and tobacco as these are historically "acceptable"...but what government will legalise cocaine or heroin unless they can also tax it? which would cause some controversy. methinks.
I am not against some relaxation on cannabis, certainly for medicinal purposes, but once you start...