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E-cigarettes Add Heavy Metals to the Environment E-cigarettes are still a small portion of the cigarette market, but they are steadily growing in popularity
Among these participants, in three consecutive waves, 68 (2.1%) remained as youth, 66 (2.3%) became age up youth, 507 (23.5%) were young adults, 67 (3.6%) became age up young adults, and 931 (68.5%) were adults
If the protocol change necessitates revisions to the consent form, all participants currently enrolled in the study will be told of the changes and asked to sign the new version of the consent form
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