I've lost family members because of their smoking habits and obesity. Both of those things disgust me now.
What is it about smoking that disgusts you?
It's very harmful and causes nicotine addiction.
You can't always help being obese if it's caused by a health problem and it can be difficult to stop smoking once you start.
You are just lecturing me for no reason. I should eat what I want and smoke.
You should avoid judging people based on those things that are hard to change. Don't you have things about yourself you would not want someone to judge?