what is the best way to quit smoking

Hello, i'm not a smoker.But my father and grandfather are.My grandfather had quitted smoking someday ago.He just heard his doctor said to him "you must quit smoking,or you'll ill badly."From then on ,he never smoking.For my father i bag him to do so,but he can't.And my grandmother said the best way to quit smoking is one's will. For my husband, i want him to quit,he can't.He said it's uncomfortable very much.Then i read some recent books.One way is eat some salad(just white turnips and white grantuated sugar) in the morning.Now he smoke less than before not "no". I wish you find the best way to quit smoking.Then i'll follow you.Wait your good news.Thanks.