One of the most unfortunate aspects of smoking, is that even though you may not choose to harm your body by smoking yourself, you may simply be harmed by being around those who make that decision. If you look at this LINK, it will tell you that according to THE TRUTH website, 50,000 people die from secondhand smoke-related diseases.
This poster shows an illustration of some of the problems associated with secondhand smoke:
If you read this following ARTICLE some people are even completely unaware that they are at risk for premature death, such as the New Zealanders in this article who work at pubs and bars without clean indoor air legislation.
Here is a somewhat humorous approach through VIDEO that illustrates the number of people you can effect with secondhand smoking.
Tobacco Facts 