A cycle in which one smokes a cigarette and then lights up another as soon as the first one is finished. The only limit is how many cigarettes you have on hand.
You can usuallyfind me chain smoking when I'm utterly stoned or drunk (or both), terribly bored, or just in that mood to smoke.
Not a wise thing to do, even if you are an excessive smoker. Usually results in one feeling nauseous, leading to violent vomiting, light-headedness and a general emotion of feeling like shit.