Answer:
C. never
Explanation:
Second-hand smoke is the inhalation of smoke from tobacco products, such as cigarettes, cigar, cigarillos, pipe, hookah and other smoke producers, by non-smokers who live with smokers indoors breathing the same toxic substances as the smoker. inhale. Second-hand smoke is never safe because of the toxicity of smoke, so people should always avoid exposure to secondhand smoke.
Cigarette smoke is a mixture of approximately 4,720 different toxic substances consisting of two fundamental phases: particulate and gaseous. The gas phase is composed, among others, of carbon monoxide, ammonia, ketones, formaldehyde, acetaldehyde, acrolein. The particulate phase contains nicotine and tar.
