What are the affects of second hand smoke?

Secondhand smoke is poisonous and has over 4000 chemicals, including 50 that can cause cancer. Breathing secondhand smoke can be more dangerous than inhaling smoke through a cigarette. It has twice as much nicotine and tar as the smoke that people smoking inhale and five times more carbon monoxide, a deadly gas that starves your body of oxygen.

It's technically worse than normal smoking; which doesn't make sense. But if someone that doesn't smoke breaths in your smoke, it's slightly worse; because they might not be used to it.