Although everything AW said was true, you all are missing my point. Why should people have to put up with something potentially harmful and disgusting around them. People have the choice to avoid the other things that were listed on a personal level, but people are still heavily influenced by secondhand smoke, even in the open.
According the the American Cancer Society, secondhand smoke in public places can lead to cancer and other diseases as well as death in children. Although people fear the loss of business, "there is no credible evidence that going smoke-free is bad for business." and also "Public places where children go are a special area of concern."
The ACS also states that "there are no safe levels of secondhand smoke".
The American Lung Association also states that levels of secondhand smoke can still remain hours after the smoker has put out his or her cigarette.
Unfortunately, coffee and sunburns don't linger and don't kill others, so we're really on two different levels here.
Sources:
http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=35422
http://www.cancer.org/docroot/PED/co...Indoor_Air.asp