coffe is a drug?biologic explaination

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coffe provokes fisical addiction?the answer is YES! in fact caffeine is a stimulanting,it's the antagonist of adenosina and inhibits its assumption.adenosina is a natural neurotrasmitter with calming effect on our.when we drink a cup of coffee,caffeine doesn't allow the assumption of adenosina.the cells aim to realize "omeostasi"(they preserve the equilibrium on their elements)and if we drink some cup of coffe every day for many years,the cells "understand" that every day it will be a surplus of caffeine and make a surplus of adenosina.if you don't drink coffee for a day you will be very sleepily because the cells make the surplus of adenosina.