I'm not smoking but here are some tips i found on the internet. Hope this would help you

-Stay active: Keep yourself distracted and occupied, go for walks.
-Keep your hands/fingers busy: Squeeze balls, pencils, or paper clips are good substitutes to satisfy that need for tactile stimulation.
-Keep your mind busy: Read a book or magazine, listen to some music you love.
-Find an oral substitute: Keep other things around to pop in your mouth when you’re craving a cigarette.
-Good choices include mints, hard candy, carrot or celery sticks, gum, and sunflower seeds.
-Drink lots of water: Flushing toxins from your body minimizes withdrawal symptoms and helps cravings pass faster.

Source: helpguide.org