why second hand smoke is bad?

it's not it's good for you.

The above is the typical non-smoker argument. But the smoker has no immunity from the smoke either. The non-smoker doesn't take into consideration the pollutants in the air they breath everyday. Polluted by whom? Big corporations that make things like cars etc. They use processes that pollute the air far worse than second hand smoke.(Global warming) So their/non-smokers argument is null and void.

Secondhand smoke is bad because it contains hundred of chemicals, dozens of them known toxins and/or carcinogens. Secondhand smoke causes lung cancer, heart disease and Sudden Infant Death Syndrome. The Centers for Disease Control and Prevention has some good info on this.

http://www.cdc.gov/tobacco/data_statistics/fact_sh...

Also take a look at the US Surgeon General site on the same subject.

http://www.surgeongeneral.gov/library/secondhandsm...

because whoever else is around the smoker (nonsmoker or smoker), they are breathing in the stuff in the air from the smoke. basically thats it.

because the lungs of the none smoker is breathing the air constantly and has no immunity from which the smoker has trained their body to do !!!

because the doctors say and we just agree to what they say cuz they have more knowledge and experience from seeing others. So i'm just gona close my eyes and go with them.