Addiction is addiction. Whether you’re addicted because you took a drug that your brain now depends on, or you’ve gotten used to doing something that makes you happy and your brain depends on the stimulus to make the happy juice, addiction is a physiological response. The effects on your brain are chemical. Your addiction is marked by the changes in thinking to seek and obtain your particular “high” in whatever form your brain needs, and you will experience withdrawal if you stop.
Some substances and activities are highly addictive, because they are designed to be. Marijuana is more potent than ever, and the experience of shopping for different strains and trying all the “flavors” is itself a little reward system.
People want to make distinctions between chemical addiction and psychological addiction, and there are differences, but addiction is addiction.