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The strongest design would follow an entire population of youth beginning at an age at which risk of use of any product is negligible (e.g., 10 years old) and investigate time-varying associations between e-cigarette ever use and later combustible tobacco cigarette use at multiple developmental stages throughout the entire period of risk (e.g., up until age 29), while using multiple methods to establish temporal precedence of vaping relative to smoking

Available from May 1, 2020)

FIGURE 1 We also examined the frequency that products did not include the statement inclusive of all taxes

Mislabeling of CBD products : Some CBD products may contain more THC than advertised, which could increase the likelihood of a positive drug test result for THC

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