How Long Can You Smell Vape Smoke On Someone I can do it at home, the smell won't linger': Do youths who vape know what they're inhaling? Sitting somewhere when a cloud of cotton candy vapor washes over you? If you can smell the sweet scent of a vape, that's not a great sign. How Smoking vs Vaping Affects Your Lungs You Must See This ! ! Secondhand vape exposure: Risks and side effects