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And so you get this thought process that they have

Dr Rachel Orritt, from Cancer Research UK, said: "It's a really motivating idea that people who stop smoking might reap the benefits twice over - by preventing more tobacco-related damage to lung cells, and by giving their lungs the chance to balance out some of the existing damage with healthier cells." Follow James on Twitter.

Look for yellowing, brown spots, or visible mould growth, which indicate the need for immediate replacement

Disclosure: The VIP Uno e-cigarette used for this review was supplied by ElectricTobacconist.co.uk

The most commonly used way to quit smoking involves Nicotine Replacement Therapy (NRT)