For non-smokers with friends who smoke, does them smoking make you sad?

My dad is a heavy smoker and it makes me really sad that he is hurting not only himself, but the ones around him. Watching his health decline, the lack of energy, the terrible coughing just sucks... Beside poisoning himself constantly, he's wasting money that could help both himself and my mom to retire or just in general live a better life. It really sucks. We have talked to him about it countless times, but he wants none of it. So we just have to watch him slowly kill himself. Smoking sucks