An important point: It's not the "smartphones"- Its the APPS, specifically the social media apps, but really this applies the vast majority of apps. Rather than selling value, most are attention-parasites which inevitably harm the user. They become skinner boxes designed to keep us engaged, by any means necessary. To me, it highlights a key point of FOSS, which is that we should not harm our users.
To be more precise, it's the model of engagement that bombards the eyes, ears and brain that's the problem. We need social media models that don't require 24/7 engagement.