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But emerging studies suggest serious harmful effects on the developing brains of teenagers

She said: "Vapes increase smokers' chances of successfully quitting, as do vouchers for pregnant smokers, so these are welcome steps in the right direction, but they are nowhere near sufficient." Sarah MacFadyen, from charity Asthma and Lung UK, said tackling addiction was more complex than just swapping cigarettes for vapes, saying "what smokers need is stop smoking services offering personalised support"

A medium tomato contains approximately 1,400 g (1.4 mg) of nicotine, while a cigarette contains 10-12 mg of nicotine

you get symptoms of nicotine overdose such as nausea, vomiting, dizziness, weakness and rapid heartbeat