To help reduce stress while you quit smoking eat a healthy diet, exercise regularly (Speak with your physician before beginning any exercise program.), make time for yourself, do things you enjoy, reduce your intake of alcohol and caffeine, and practice stress reduction techniques (e.g., meditation, yoga).
Knowing your smoking triggers is only the first step. Learn how to quit for good.
Identifying your cigarette cravings can make it easier to deal with the urge to smoke.
Nicotine addiction is the biological reason...but a host of other factors are at play.