Addiction
An addiction was an excessive dependence on particular substances or actions, with physical and psychological consequences, with two examples being drug addiction and holo-addiction. An individual with an addiction was known as an addict. ()

The Ktarian game had addictive effects, through stimulating the pleasure centers of the brain. ()

The term could be used loosely to describe something with which one could become harmlessly obsessed. In 2374, Harry Kim described the Vulcan game kal-toh as "addictive" to Seven of Nine. ()

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Medical conditions