I've noticed several side effects such as decreased attention span, decreased sociability, decreased desire to do anything other than your preferred method of attention capturing.

Frankly I just think that many of these things are simply addictive and, with an appeal to naturalism, I don't think it is what humans were meant to do. Increased smartphone use or TV watching or video games probably almost never results in increased happiness over the long term.

Not to mention the ability to use attention capturing as a way to hide from one's own emotions.