Addictive substances directly effect the biochemistry of motivation. Directly acting on some subset of receptors (or other mechanisms) in the brain on neurons a

Addictive substances directly effect the biochemistry of motivation. Directly acting on some subset of receptors (or other mechanisms) in the brain on neurons and glia is entirely different from something coming in through your senses. One is direct and one in indirect. For video games to become addictive they actually have to be fun and rewarding; probably in a random interval operant conditioning pattern. For methamphetamine to become addictive you don't even need to be having fun or experiencing reward. That's a big difference. Addicting drugs are usually intrinsically addicting. No video game is. Most video game "addiction" material is from for profit private treatment centers and rarely peer reviewed. It is not represented in the legal medical codes or in high impact journals.