The smoke that engulfs a room when someone lights a cigarette is more than just a nuisance. Second-hand smoke kills over half a million people world wide. Half of which are women and children (link).
A list of the chemicals in tobacco smoke is here.
The choice you make to partake in a habit that is bad for your health is one thing but what if other people around you are affected by your choices? Maybe you don’t care. Or maybe you do care. One thing is undeniable we are all affected by smoking.