Eat regular meals to avoid being hungry. Don't confuse needing to eat with the desire to put a cigarette in your mouth. Take up a hobby that keeps your hands busy. Try knitting, carpentry, painting, or making bread. Suck on a sugar-free hard candy or mint.
Smoking is a pleasure.
Smoking cigarettes is pleasant and enjoyable. Smoking makes good times better. I want a cigarette most when I am comfortable and relaxed. Almost two out of three smokers say they just plain enjoy smoking. But it can be easier to quit when you focus on enjoying yourself without tobacco.