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In laboratory testing, filters have been shown to reduce "tar" and nicotine smoke yields up to 50%, with a greater removal rate for certain classes of compounds (e.g., phenols) compared to othersthe filters are particularly inefficient at removing gases of very low molecular weight, such as carbon monoxide

It is real although you can't see it, you KNOW you'll get hurt if you violate it by a sudden fall

doi:10.1002/14651858.CD001055.pub5

However, despite this decline, several countries still have alarmingly high smoking rates, with nearly half of their populations continuing to smoke

Saxena A, Khiangte B, Tiewsoh I