is smoking one cigarette a day dangerous per enough to increase risk for heart disease, stroke No Safe Level of Smoking

One of the known factors that prevents the immune system from functioning properly is cigarette smoke

Under specific circumstances such as sunlight and moisture cigarette filters can break into smaller plastic pieces, containing and eventually leaching out some of the 7000 chemicals contained in a cigarette, many of which are environmentally toxic, and at least 50 are known human carcinogens

By being open and cooperative, you help the security team do their job efficiently

Cigarette Smoke Residue The residual nicotine and other chemicals left on surfaces and fur by tobacco smoke pose an additional hidden danger to your pets

Roger Ebert.com