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Sifting through contradictory evidence is common when it comes to choosing the right thing to do to improve our health, not least at new year when many of us promise to leave old habits behind and make a fresh start. One topic that is almost guaranteed to provoke arguments is e-cigarettes. Thousands of research papers have been published about these devices over the past decade. But we do not seem to be much closer to a global consensus on their risks or benefits, [...]