To your points I would add the following difference between TikTok on the one hand and cheeseburgers, drugs, cigarettes, etc. on the other.

3. Targeting -- even under the (debatable) premise that they are intentionally designed to be addictive, cheeseburgers, drugs and cigarettes do not actively target each addict by optimising their properties to their individual addiction.

If I am addicted to smoking, the tobacco industry does indeed try to keep me hooked, among other things by offering me many flavours and alternatives. However, the cigarettes I personally consume are not constantly adjusting their formula, appearance and packet design specifically to satisfy my tastes and desires.

Yes. Target the algorithms, not the method of delivery. Hacker news also counts as social media, but here we all are seeing the same feed on the same site with minimal (if not zero) tracking to try and extract info from the audience.

Even a first step of requiring transparency in the algorithms would quickly shatter this stronghold on people's minds.

case in point: lots of places have lots of restrictions (either through legislation or just industry norms, usually a combination of both) about advertising for alcohol or tobacco.

And those efforts seem effective to me, at least anecdotally. I don't feel particularly bad about those restrictions either.

Don't forget the most important part. Attempting to opt-out means social exclusion for a vast majority of the population.