Vaping or using snus during pregnancy raises the risk of sudden infant death by up to three times, a study suggests.Both e-cigarettes and snus - sometimes called 'dip' or smokeless tobacco - have become increasingly popular among Americans looking to give up traditional cigarettes, and are sold in most convenience stores in the US.They are seen by many as a safer alternative to traditional cigarettes but evidence is mounting showing they carry health risks of their own.
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