Regarding the mercury in cigarettes, I found that info in the book called 1000+ reasons to quit smoking, which obviously did not help. But this thread has nailed it, by giving the best reason to quit. If it's bad enough as a second hand smoke goes, think about inhaling it into your lungs with all its mercury content and then exhaling it for 8 years. Add this to fillings, vaccines, fish, food, air, etc. and you can go overboard. On the good note Fluorescent lights dont' contain mercury and they are everywhere, so cheers!