Residual smoke affects health

Third-hand smoke particles can become reactivated when they come into contact with the natural ammonia that is emitted from the human body. Indoor temperatures and humidity also play a role in that process. — TNS

Dodging the clouds of toxic cigarette smoke along city streets and at building entrances has become the norm for those wanting to avoid the health risks from breathing in second-hand smoke.

But if you think being in a smoke-free building will shield you from the negative health effects of second-hand smoke, you are in for a surprise.