Do e-cigs contain anti-freeze and should you be worried?

Electronic cigarettes contain nicotine and water solution that is used to produce vapor. In addition, these devices have another special ingredient called propylene glycol, which serves as a solvent. Although this substance is used in anti-freeze, the amount used in e-cigs is so minimal that it is not harmful at all. Keep in mind that this ingredient should not be confused with another substance called ethylene glycol, which is an essential component in automobile...

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