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What is propylene glycol in electronic cigarette, is it safe?

Propylene glycol is an organic component that is odorless and colorless, which looks like soft gelatin. The US Food and Drug Administration (FDA) assesses it as safe for health and allows it to be used in food and cosmetics. It does not contain tar and does not stick to the lungs. It's the same mix that's used to make smoke during a concert.