Nicotine is the active ingredient in cigarette and chewable tobacco. But there are hundreds of other carcinogens and psycho-active substances and they are highly dangerous to the physical and psychological health a person. People can smoke as unhealthy way of coping stress
, part of nicotine withdrawal, to overcome short term depression
(which it worsens over a longer term). To overcome this the withdrawal needs to be addressed and anti craving medications started and comorbid anxiety, etc like psychological and constipation
, etc like physical symptoms needs to be treated. So you kindly consult a psychiatrist
to stop smoking
. All the best.