What is passive smoking and what are the effects of it?

Passive smoking is when a person inhales cigarette smoke without actually smoking. Someone in the same room or car may be smoking, and others can inhale the second hand smoke.

The effects can be similar to that of smoking, if the person lives iwth a smoker or spends a lot of time around people smoking.  Generally, occasional exposure isn't harmful.

The answer is d because , safety almost always works, to prevent stds and pregnancy