Let's step back a second and use a very clear observation. This is like saying to someone overweight - why don't you stop eating crappy food. Look at the mis-information, man. Additionally, social "norms" force a lot of cultural influence to do so. This falls in line that America is a "drinking" society. Go watch Ken Burn's Prohibition just a fact of record. I haven't even touched on the addiction aspects, because I think its self-explanatory on how it plays out on people - no matter if its eating, smoking, drinking, etc.