Health warning labels on heated tobacco products and their impact on use intentions and risk perceptions: a cross-sectional study of adult tobacco users in the US and Israel.

In bivariate analyses, correlates of responding “don’t know” and “no effect” were very similar; furthermore, in multivariable analyses including versus excluding “don’t know” from the “no effect” outcome, findings did not change (except in some cases where significant findings became marginally significant due to reduced power).

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