My stepfather quit because the doctor told him he was going to die (soon) otherwise.
My stepmother uses the nicotine gum, but still smokes a bit on the side.
My mother still smokes.
After living through all of this, I have never had the desire to start. I have friends who quit smoking, and all of the success stories came from quitting cold turkey. One of ex-smokers even complains about smokers now that he can smell them. Best of luck!