Wearing a mask to prevent smoking second-hand smoke useful, now sad, do not know how to do, thank you ah!

Wearing a mask to block second-hand smoke to a certain extent, the so-called second-hand smoke is mainly nicotine and carbon monoxide and other toxic substances, masks are only physically blocked, and if you are often exposed to second-hand smoke, it is recommended that you still need to clean up from the inside, such as clearing the lungs of the things, pear water, rock candy, pig lungs, etc., if you can't stand the taste, you can let smokers contain a mint, or you can contain your own, can be

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