The most telling point is that blu does not offer its disposable products in flavors other than tobacco (classic) or menthol. Note that the disposable products are the ones that are relevant to children because they are the cheapest and most likely to be used by kids. It is very unlikely that kids are going to unleash the money required to purchase the charging kit. Blu offers rechargeable starter kits that do contain flavorings, but does not offer the disposables in flavors other than tobacco or menthol. Kids would have to shell out a minimum of $70 for the starter kit.

Although the survey approach described above would lead to "invalid" results, I would never argue that survey studies should be thrown out and that we should only be conducting RCTs. My point is that there are strengths and limitations of various study designs, and causal inference is enhanced by having research evidence from multiple study designs. On balance, the strengths and weaknesses balance each other out, leading to a much greater ability to draw valid conclusions.

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