why do people smoke?

I used to smoke cigarettes heavily last winter, but I was up to almost a pack a day on a weekend day and about a half pack on weekdays. After awhile I started rolling my own cigarrettes, and then got away from that idea and had a pipe now and again. I might have a cig every few days or so, mainly because it is nice to have one after smoking some marijuana. Tomorrow is going to start a hazy weekend. I'm getting hooked up cheap with a 1/2 oz. of marijuana, a two 1.75s of tequila, and a pack of marb reds. I don't intend to consume all of that in the next 3 days, but I just like looking forward to getting some 'party materials' for the next couple of weeks.