Many people smoke to deal with stress. Part of quitting is finding healthier ways to cope without cigarettes. Learn better ways to handle stress and take care of yourself that do not include reaching for a cigarette.
You may feel mood shifts after quitting, and know this is normal. Learning nicotine-free ways to cope with moods can help you manage those shifts. Remember that these feelings are temporary and will get easier after the first few weeks.
Slips and relapses are not failures, but rather opportunities to learn what works for you and what does not. It usually takes many times before someone quits for good. A slip is having one or two cigarettes while trying to quit. A relapse is when you go back to regular smoking. Remember that both are temporary setbacks - but common parts of the quitting journey.