Has anyone been in a similar situation?

My dad is nearly 50, works a stressful job 12 hours a day 6 days a week. He smokes a pack of cigarettes a day and lately his cough has been so bad. He coughs for like an hour when he gets up in the morning. I’m so worried and I really don’t want my dad to die. He means so much to me and has done so much for family and doesn’t get to live the life he deserves. He’s gonna die real soon if he keeps smoking. I know people say that the only way someone can stop is by themselves but there has to be something I can do😭 I can’t see him die this early, I just couldn’t bare it. Has anyone got any tips! I’m scared I’ll regret it if I don’t try something. There is so much he still has to do in this world. The reason hes so stressed is because he over works to provide for his family. Please someone has to have some sort of advice and you have no idea how much I’d appreciate it.