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E-square is an electronic cigarette, or E-cigarette. It comes in different flavors and usually contains nicotine. E-square also contains propylene glycol and vegetable glycerin but no tar so there's no lung cancer, but nicotine could cause dependence. E-squares are for adults 18 and over only. In the US, they bumped it up to 21 and over. An E-square is a vape.
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