We fear that these drugs have developmental impacts but beyond that we also forbid them in restaurants and indoor environments quite generally even for adults. So adult usage is tolerated in their own home or in the outdoor public environment (although some further restrictions apply here).
I am sympathetic to the idea that social media may also have social development impacts separate from their negative social impacts, but my experience in life is that actually people appear to socially degenerate with overexposure. Thus we probably need some regulation analogous to forbidding smoking in restaurants but for social media or limiting gambler's access. But indeed, maybe on top of that we also need bans for minors.
I am sympathetic to the idea that social media may also have social development impacts separate from their negative social impacts, but my experience in life is that actually people appear to socially degenerate with overexposure. Thus we probably need some regulation analogous to forbidding smoking in restaurants but for social media or limiting gambler's access. But indeed, maybe on top of that we also need bans for minors.