Second hand smoke is a health risk. period.
You might find these studies interesting:
Quote:
The ban on smoking in public places, such as bars and restaurants, has been one of the greatest public health debates of the early 21st century. Now, two large studies suggest that communities that pass laws to curb secondhand smoke get a big payoff -- a drop in heart attacks.
Overall, American, Canadian, and European cities that have implemented smoking bans had an average of 17 percent fewer heart attacks in the first year, compared with communities who had not taken such measures.
Then, each year after implementing smoking bans (at least for the first three years, the longest period studied), smoke-free communities have an average 26 percent decline in heart attacks, compared with those areas that still allow smokers to light up in public places....
Big drop in heart attacks after smoking bans, studies say - CNN.com
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IMO, the "payoff" is good public policy...and in the long term, the cost issue you cited initially becomes far less relevant.