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Many vapers enjoy experimenting with vape tricks, such as the French Inhale, which involve creative ways of exhaling vapour for visual effects - some of these can be achieved with low-power devices, but the 'vaping tricks' scene usually involves more powerful devices for vapers who favour more voluminous clouds of vapour - known as 'cloud chasers'

It uses a peroxide-based whitening gel activated by LED light, giving you a similar brightening effect over multiple applications

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Sometimes we have to shut the window during mealtimes when we are right by it, and the house becomes stuffy, she said

Editors note: MVS Chandrashekhar is a professor of electrical engineering at the University of South Carolina