What do you suggest if i want my dad to stop smoking.?

He has to decide: That he wants to do it, but loved ones can express their concern for his health and happiness, and tell him that they want him to be around as long as possible. If you are living in the same home, you can certainly ask that you not be exposed to second hand smoke. Get some pamphlets or other material (1-800-quitnow) and keep them around the house. Enlist other family members if possible, don't nag.

Quit contract.: Smokers are very good at fooling themselves into smoking again. With a quit contract, the smoker has to answer to you, or to a group of friends, or to a group of people who are also trying to quit. Answering to others for one's indiscretions is difficult, and can help the quitter in his/her attempt. You can watch over your Dad's attempt.