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(A note that youll usually see the CDC officially using the word respirator to refer to these kinds of face coverings that are highly effective against particles, and masks to refer to the types of face coverings that are less effective, like cloth masks and surgical masks more on those below.) The 95 in N95 also indicates that these respirators achieve a minimum of 95% filtration efficiency against dangerous particles, according to the CDC

That they must present similar risks

Knowing the pack size also helps smokers estimate their consumption and budget more effectively

Some researchers argue that e-cigarettes should be taxed at a rate that creates a price high enough to discourage youth initiation, but at a rate that is also lower than the tax on cigarettes, proportional to the products lower level of danger

The next time you reach for your e-cigarette, consider how efficiently it delivers nicotine compared to traditional smoking habits

Wargocki et al