There are many side effects of quitting and some can be really uncomfortable. You may experience some or all of the symptoms below but rest assured it's temporary. These symptoms won't kill you, but continuing to smoke most certainly will.
Headaches or a general heaviness. This is a classic smoking withdrawal symptom, often caused by your sinuses clearing out.
Shaking, sweating or feeling very cold.
Coughing, hacking, runny nose, wheezing and shortness of breath. Seems strange to get these when you've quit, but your body is ridding itself of years of tar and built-up residues. In other words, at last taking the opportunity of having a good clean-out.
Insomnia is common. Well, it is stressful to quit and break your normal patterns. As with all stress — good or bad, sleep challenges can surface.
Sour stomach or stomach pains. Your digestion might get out of whack for a little while.
Pains, pains, pains. Some smokers get stomach cramps, sore gums, pains in chest... pains anywhere. Your mind and body are going through a healing crisis and they are going to remind you of what they are missing.
Tiredness and a general zapped feeling.
Mild depression or sadness. There goes your best friend that you turned to in need. Tobacco was always handy to blot out your worries and give you your fix.
Anxiety. The jitters and fear of facing life without tobacco might try and overwhelm you.
Boredom and loneliness. There are now a few gaps in your day to fill up. A smoker spends a lot of time hanging about either smoking, rolling or buying and preparing things for their habit.
Anger or short-temper. Despite making a positive change in your life, this can still be stressful. All life changing events, good and bad are seen by the body as stress. It's not necessarily bad, but it can cause you to over re-act and be a bit on a knife-edge for a short time.
Be kind to yourself during this time. Get extra rest and avoid stressful situations when at all possible. Exercise is a wonderful aid in helping the body and mind. Most of all believe in yourself because you are a warrior! You got this!
--The list above are statements I have found and identified with from various articles .-- Author (s) unknown.