Neurotransmitters: The addiction or obssesion itself causes release of the brains own feel good chemicals such as Dopamine and/or endorphins. Ever heard of a "runners high". Some gamblers have a reduced urge to gamble with the same drug used for alcohol cravings, naltrexone. Even with substances, once addiction is in place, the brain releases these same chemicals just with the thought of drugs, no drug needed.
Answered 12/12/2018
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Addictive behaviors: Some people become addicted to certain behaviors, driven by a compulsion to repeat them. Coca Cola and other soft drinks, sex, pornography, thrill seekers, and a host of others
Answered 6/15/2015
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