I've thought about this a fair bit over the last decade. Full disclosure: I'm a smartphone minimalist. I use so little data on my phone I don't know how much I have, it was 100M per month but I think the telco increased it because it didn't fit their plans. I spend $9.99/mth for my phone service.

We evolved to live in the plains of Africa. We evolved to live is small bands of hunter-gatherers who occasionally got together to have huge parties.

Our senses have enough bandwidth to enjoy special mushrooms and to avoid predators. But smartphones can throw far more information at us than that. And for some reason I can't fathom, when your phone chirps or shakes you MUST check it NOW.

I believe that we should look deeper at how these things might affect young brains. Just as THC is mostly harmless for adults, but royally fucks up children's brain development.

Not being a psychologist/neuroscientist I have no idea how to test this hypothesis.