To add on to the other answer, for folks with ADHD symptoms it was likely there before smartphones too - you/they just didn't realize it (like I didn't myself).

To add on to the other answer, for folks with ADHD symptoms it was likely there before smartphones too - you/they just didn't realize it (like I didn't myself). A doctor however is far more capable of this judgement. Another simple test - after a week long (say) tech detox, do they (permanently) improve, or are the benefits very little (tending to perhaps even being distracted during that week)?