When I gotta study in the end of term, when exams are coming up... I cannot say no when I see a pack of cigarettes.
One or two sticks for a day - enough. Socially, when I join a party (but that's a so rare occassion, really) I may smoke a lot. I prefer waterpipe (narghile) because of taste and it's more like a ceremony than some quicky damaging. (If I smoke cigrettes, I do it day by day... if I smoke via narghile, it happens max. only two or three times in a month. Or only once in a month I do it.)
Since I can make/roll own cigarettes, I smoke lesser.