Does anyone have any great insights on quitting smoking?

My boyfriend smokes as a way to manage his stress and anxity. He also smokes marijuana, which I have no problem with. But he has difficulties quitting cigarette because partly, he doesn’t seem to see the extreamly negative impact smoking does to his health, he also does not see that smoking does not only impact himself, but those that care about him.

I believe smoking is part of his lifestyle, and the root cause that he is an addict is because of his philosphy that nothing really matters. His parents went through a divorce and his experience in relationship might have something to do with the anixety and emotional distress that he is so used to, he also has a hard time trusting people.

I think its related to his depression as well, and I share some of his feelings.
I do not see smoking as just a bad habit, I think its related to how we see ourselves and how to manage life.

Does anyone have any first hand or second hand experience on how to reduce anixety or to manage life in a way that reduce chemical imbalance or develop a more positive approach to life?