Smoking is harful to not just your health but also to people who live with you. Its clearly mentioned in all cigarette packets that it is harmful so we dont need to debate on that do we?

Pollution is harmful to health as well- smoking adds to pollution.

Drinking and driving is a crime. You could kill somone on the road if you do that.

Sleeping with different people is not harmnful to you physically if you take proper precautions but pyschologically it could harm you but then again depends on what kinda person you are.

I dream of a better tomorrow where Chickens can cross the Road without having their motives questioned - Unknown