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That made it difficult to assess whether the carcinogen found in the urine was actually from the e-cigarette use or from the cigarette use. Further research is needed, said Bjurlin, who wants to determine the threshold of exposure to carcinogens that would lead to development of bladder cancer or other cancer types

The best choice for long-term well-being is to avoid smoking

Call your doctor or nurse advice line now or seek immediate medical care if: You have trouble breathing

Cori Ritchey, C.S.C.S., is the fitness editor at Women's Health , as well as a certified strength and condition coach and group fitness instructor