You're asking if I have a strong argument against targeting children with tobacco products?
The existence of them, yeah. I don't think it's so clear cut that it'd be a net increase in harm. Advertising I'm not so sure about, but as for the mere existence of them:
Group A is going to smoke regardless, having a healthier product reduces harm
Group B is never going to smoke no matter what's on offer
You’re missing Group C, who didn’t offer cigarettes to their kids until their kids heard of these “healthy” cigarettes that are “safe for kids”
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Absolutely no cigarettes should be marketed to children. That doesn't mean various cigarette-adjacent products cannot exist.
The net harm result really only changes because the scope and numbers differ. I don't think I've ever met anyone who actually allows their kids to smoke, I see a lot who give them tablets though.
If we instead imagine a world where parents allowed, even encouraged 60% of children to smoke, and there was no clear route to outright stopping them, giving them at least a better alternative that doesn't hurt them as much would be worth considering
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