

I call this effect borrowing energy from the future.
I used to drink around 3 big mugs of coffee a day. Then I just stopped, cold turkey. Took a few months to get adjusted. But what surprised me, is that ALL tolerance to caffeine is gone. If I drink a cup of black tea, I will feel more focussed for a few hours, and less focussed a day or two afterwards.
I now only drink caffeine strategically. If I think todays problems are more important than the next two days problems, I drink some black tea or a cup of coffee. Otherwise I stick to decaf coffee, which fills the habit of drinking coffee perfectly.
The flipside of this coin, is that a lot of people want to feel desired. Having someone who active craves you, can satisfy that desire.