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http://www.allvoices.com/contributed-news/12776603-latest-studies-confirm-ecigarette-vapor-safety
However, bystanders concerned about inhaling nicotine are unlikely to lock lips with an e-cigarette user, and since no nicotine was detected in the air samples taken in the stainless steel test chamber, it is apparent that the tiny amount of nicotine exhaled by the user is quickly diluted by mixing with the ambient air. As a result, bystanders are not exposed to nicotine at all.