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Secondary outcomes There was no clear evidence of a difference in post-intervention scores of heaviness of smoking (mean difference = 0.30, F (1,72) = 1.263, p = 0.27, motivation to stop smoking (mean difference = 0.46, F (1,72) = 2.012, p = 0.16) or autonomy over smoking (mean difference = 0.25, F (1,72) = 0.042, p = 0.84) between study arms with adjustment for the same measures taken at baseline (Table 2)

Inhaling increases exposure to nicotine, tar, and carcinogens, raising the risk of lung disease, heart disease, and cancer

Juul is the most popular e-cigarette marketed in the United States

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