Smoke what? Haha. I smoke marijuana pretty regularly. I got into the habit when I first got employed and had money comin' out the wazoo, I'd be able to sustain quite a habit then. Now I'm unemployed and I scrounge for money. And no! Not all my money goes to the stuff. I buy very little now compared to what I used to (I would spend nearly $250/mo on pot, now I spend, on average, $30/mo). As for tobacco, I used to smoke cigarettes because I liked the action of smoking. But those are ridiculously expensive, taste awful and leave a terrible smell afterward. So I stopped. I'm over a year without cigarettes now and damn proud.
Drinking.... Well, that's why I smoke pot. Drinking isn't for me. Not surprisingly, I do a lot of dumb sht when I drink, that I regret the next day. And after I start drinking, it becomes hard for me to stop. Which leads to said dumb sht. But yes, on occasion I'll drink. I try to keep it to beer, as that won't get me too trashed. When I start playing with hard alcohol is when my mind leaves and impulse takes charge. It's also very expensive to drink. That said, I do love a little alcohol buzz. Makes me relaxed.