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Smoking is against the law for people under 20, but it is easy to skirt this law

The vascular system operates in a fundamentally unidirectional manner, with substances in the phloem that migrate downward, not returning to their initial position through the xylem 150

Higher CADR numbers indicate faster air cleaning

However, this was partially offset by sales of non-menthol cigarettes 6

So, rather than "smokers," users of e-cigarettes often call themselves "vapers." The FDA currently doesn't regulate e-cigarettes, but the agency is working to change that by creating rules that would classify the devices as a tobacco product