Smoking is probably not great, but lets talk about eating to the point you are fat/obese....
Never hear about that one.
Obesity is worse than smoking. With smoking you can totally quit. With overeating you can change but never completely quit eating, therefore the temptation is always with you.
As for the bad example to children, not only do they see what you're eating but it's there for them to consume also. With smoking the product is not there
for their consumption.
Drive past a high school and look at the young teens. In my city many, far too many are at least 30-40 pounds overweight. This didn't come from any medication.
Add in the lack of exercise and these young people are a heart attack waiting to happen.
In my family there have been heavy smokers. Some died at 87-106 years old. No heart attacks, cancer etc. But they were active!!!!
Must be the genes.