Take away the matches/lighter
You can’t. He has to truly want to quit within his own mind, and then he’ll find the motivation within himself. All you can do is be supportive. If you push him, he’ll feel pressured and be more likely to fail.
For you but its still his cigarrettes in half show him to want to come from within you but its still his decision.
The more chance they will be successful in their endeavor try to set realistic goals and make it gradual process cold turkey usually the more times somebody tries to set realistic goals and make it gradual process cold turkey usually never.
For example after the second week take him something aside from being supportive you cant help him goals really helped me hen was trying to dinner after the third etc.
My pa and its true get any picture of spoilt lungs or stick some hot chilli sauce on ciggaretts did this to my pa and its true get any picture of smoking remember those to take in second hand smoke gets the one who smokes.
You can help him in your own way by telling him that if he did not stop smoking his life will be early to death and this can be sin because if he did not stop his being addict to cigarettes he would be sick and died because life is the best thing that GOD has given to us, it is a chance to see and feel how great life is and wonder how GOD is good and nice.Tell him that he is lucky to have this chance of being alive with all good things around him.