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For more tips, including how to prevent your fingers from getting stained by nicotine, read on

Is cotinine in tobacco or nicotine

Most people use e-liquid at lower strength than 1.8%, so need more puffs to reach the equivalent of a cigarette

Youth vaping has surged to what government officials have called epidemic levels

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Role of funding source This study was funded by a PhD studentship to OMM from the UK Clinical Research Collaboration, and by the Medical Research Council (grant number MC_UU_12-13/6)