For those who doubt the dangers of second hand smoke consider the statistics.
The biggest benefit from limiting secondhand smoke is from the reduction in cardiac disease.
It has been demonstrated several times that towns initiating laws limiting public and workplace smoking see a decrease in heart attack rates within one year of enacting the laws.
Numerous studies of secondhand smoke have been completed over the past 40 years. A meta-analysis of 52 studies prepared for the 2006 Surgeon General’s Report on Smoking and Health showed that nonsmokers who had long-term (more than 20 years) exposure to secondhand smoke were 1.21 times more likely to develop lung cancer compared with nonsmokers who were never exposed to secondhand smoke.
A second meta-analysis of 25 studies showed that nonsmokers who are exposed to secondhand smoke were 20% more likely to develop lung cancer compared with nonsmokers working in a smoke-free environment.
There is no way to “smoke in moderation”.
And there is no amount of “safe” second hand smoke.