Well, that's the thing about it. Once, it gets to the system it can hardly go. Or we can say it's been a habit? for them, as far as I'm aware it's a must to actively checking the charts if you are into day trading. Since a missed trade could cost them a lot.

"I've seen day traders who can't go two minutes without trying to check the charts, even at fun events where one is meant to relax. To me that's an addiction and it's no different from gambling."

I somehow agree at some point and disagree at the same time. I'd agree that day traders are regularly checking markets for a possible trade even at any events. I'd somehow disagree on the addiction side, well let's say it's their full-time income source so I purely understand why they do it. But to compare in addiction on Gambling is quite a shot. Though are still a lot of argument in regards to habitual acts and addiction.