Progressing from a "once in a while" smoker to a heavy smoker could be described as an example of

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Quizplus · Accepted Answer

Positive feedback is a loop in which a change in one direction leads to an increase in that change, rather than an attempt to maintain stability (homeostasis) or counteract it (negative feedback). In the case of smoking, the positive feedback loop could be that the addictive properties of nicotine lead a person to smoke more frequently and eventually become a heavy smoker.

Progressing from a "Once in a While" Smoker to a Heavy