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Smoking intention and progression from e-cigarette use to cigarette smoking

But most of the particles are too small to be seen

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For research question 2 a similar approach was used but required an additional step, to obtain an extra intermediate weight, because previous smoking would only occur among ever smokers and zero probability of being never smokers is problematic for weighting

Thus, the act of vaping need not be fraught with dietary guilt, and each puff, akin to sips from a can of soda, contributes only a fraction to the broader caloric spectrum