There are (at least) three ways to consider "harmful" too. + Looking at screens is actually just hard on your eyes. You can make this better (eye relief screen

There are (at least) three ways to consider "harmful" too. + Looking at screens is actually just hard on your eyes. You can make this better (eye relief screens, less brightness, make sure to look away from screens occasionally, blink...) + Spending a whole bunch of time staring at a screen may be a sign something else is going on - anxiety, depression, etc. The screen isn't the cause, it's just a form of escapism. + "Vegging" where you endlessly scroll memes or tiktoks or whatever the cool kids are doing these days. It's not quite relaxing, but it's not beneficial either. Especially with social media, it can actually be really anxiety causing.