Smoking - A way of life

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I am not a smoker but just recently learned that my son has been smoking and after a discussion reminding him that his grandmother died from a cancer caused by smoking, I feel I cannot get through to him. There are so many negative things that smoking can do to the body on the inside, and it does not even count the outside things that make it nasty to me. How would I be able to help him, he says he wants to stop, but I do not see that anytime in the future as he appears to be smoking more.