Imagine a person who enjoys alcohol, perhaps a bit too much. He has a quick three or four drinks. His blood alcohol level spikes sharply. This can be… - Jordan Peterson

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Imagine a person who enjoys alcohol, perhaps a bit too much. He has a quick three or four drinks. His blood alcohol level spikes sharply. This can be extremely exhilarating, particularly for someone who has a genetic predisposition to alcoholism.23 But it only occurs while blood alcohol levels are actively rising, and that only continues if the drinker keeps drinking. When he stops, not only does his blood alcohol level plateau and then start to sink, but his body begins to produce a variety of toxins, as it metabolizes the ethanol already consumed. He also starts to experience alcohol withdrawal, as the anxiety systems that were suppressed during intoxication start to hyper-respond. A hangover is alcohol withdrawal (which quite frequently kills withdrawing alcoholics), and it starts all too soon after drinking ceases. To continue the warm glow, and stave off the unpleasant aftermath, the drinker may just continue to drink, until all the liquor in his house is consumed, the bars are closed and his money is spent. The next day, the drinker wakes up, badly hungover. So far, this is just unfortunate. The real trouble starts when he discovers that his hangover can be “cured” with a few more drinks the morning after. Such a cure is, of course, temporary. It merely pushes the withdrawal symptoms a bit further into the future. But that might be what is required, in the short term, if the misery is sufficiently acute. So now he has learned to drink to cure his hangover. When the medication causes the disease, a positive feedback loop has been established.