<human>: Summarize the given text in a few sentences.

My father and I have had a tumultuous relationship. We were extremely close when I was young and I considered him to be not just a great father but my best friend. When I was around 12 years old my parents got divorced and my dad flew off the handle. He started drinking, gambling, and smoking.

Since then things have never been the same he's continued this self-destructive lifestyle. The worst part about it is not just that he is hurting himself but he is hurting everyone around him including me. Whenever I am with him, especially in his car, the smell of cigarettes makes me feel physically ill. After spending time with him I come home take a long shower and scrub off the ash from his car. I wake up with a horrible cough and fear that the shit he puts into his body is going to make me sick. 

I've tried everything to get him to quit and to take better care of himself but I don't know what else to do. I've looked up all the "how to help someone else quit" guides, I've told him how sick it makes me feel but nothing seems to work. Not really sure how to approach the situation to be honest.
<bot>: My dad won't stop smoking despite many many efforts by me and family, makes me feel physically ill to be around him