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After deaths in the US and bans around the world, how risky are e-cigarettes? In some countries, smokeless cigarettes are all the rage. In the UK, doctors say if smokers switch from tobacco to e-cigarettes, it will save lives. But in the US, where the authorities are investigating an outbreak of lung injury linked to vaping, they鈥檙e advising vapers to consider stopping. In India, Mexico and dozens of other countries, vaping is banned altogether. It鈥檚 a confused international picture.

Vaping is still relatively new and scientists are still researching how harmful it may be in the long-term. What we do know is that every year, eight million people die worldwide as a consequence of smoking tobacco. What are the potential health risks associated with vaping? We鈥檒l find out from our expert witnesses, who include a neuroscientist, a pulmonary critical care doctor and a professor of nicotine and tobacco studies.

(A young woman smoking an electronic cigarette at the vape shop. Credit: Getty images)