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"This study shows how little we know about toxic exposures that can result from using any one of the many different available types of e-cigarettes at different heating levels," said Eric Jacobs, the cancer society's strategic director of pharmacoepidemiology

The right dose for you depends on how much you smoked before quitting

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As part of the research - published in the journal Ecotoxicology and Environmental Safety - academics sampled locations around the city of Cambridge and found areas with as many as 128 discarded cigarette butts per sq metre

Users have their takes, too