By the way, tell how common smoking/drinking is in your locations.
I remember at school the smoking place was outside and it was possible to see people walking there. So we knew everybody to smoke or not to. Of course, it was a matter of being "adult", a consequence of being "cool guy" (in those mad 1990's it was a criminal growth, especially spreading of criminal "culture", so you may guess how a typical "cool guy" of those days looked).
In the Uni in my group nobody except 2 people of 30 smoked, though in another group in my department/year there were about 3/4 of smokers.
Smoking is quite spread here, though among my friends there are very few (though I do neither specially seek, nor avoid persons by this streak), partially because many of them are of my Uni, with quite many I got acquainted via volleyball. When I say this to somebody, many people get wondered a lot!