Humans are literally entirely chemistry at all times. Literally anything that makes you happy/comfortable releases dopamine in your brain. Even dopamine can become addictive if applied too often, the ‘withdrawal’ would be feeling down cause you’re not as happy as usual.
You can be happy or not happy with relationships, which can cause your (misguided) definition of addiction to dopamine, and almost no part of that scenario involves external chemicals.
And all of that is just one example. You really need to attend a high school chemistry and/or biology class.
Who ever said anything about swimming? Are you just trying to deconstruct the points I made that you don’t understand? I mean you clearly have some kind of disorder, disassociative at least. Enjoy being constantly lauded for your understanding of sciences (or lack thereof).