Smoking directly causes cancer and other serious disease such as asthma and infections in the lungs and ears. Secondhand smoke is harmful, especially to children whose lungs are still developing. As a society we've taken steps to protect people from secondhand smoke. The dangers of secondhand smoke from cigarettes, cigars, and pipes come from the fact that it contains chemicals and particles we know cause cancer.
In order to protect your kids from breathing in secondhand smoke, the best thing to do is to quit smoking. You should also avoid smoking at home or in enclosed spaces. You can also make sure to avoid situations and areas in which there are several smokers, and walk away if you're close to a source of secondhand smoke.
SIDS, Whooping Cough, and Dangers of Second Hand Smoke
September 2015, Mera Goodman
Video 1: Whooping Cough
Video 2: What is SIDS
Video 3: Dangers of Second Hand Smoke
Note: These are all the sources used for every video in this series, not every source listed was used in this specific video.