It s a mitzvah to obey the laws of the community. If you quit, you won t have to worry about these regulations, which are very difficult to comply with if you re addicted to nicotine. You won t have to stand out in the cold with a cigarette dangling from your lips. Employers are more likely to hire nonsmokers, and landlords are becoming more partial to nonsmokers. Also, smoking is becoming increasingly unacceptable in society.
Smoking is associated with less education and with risk taking.
If you quit, you may find more dinner invitations coming your way. Friends won t ask you to leave the house to smoke. It s a mitzvah to spend your resources wisely to support your family. A bit much if you think about it. It s a mitzvah to face and overcome challenges in your life.