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Any explanation of human behavior involving brains and their chemistry can at best be parochial. Since our computers are *universal*, we know that they could run any algorithm the brain runs. A computer can, in principle – although we don’t yet know how to program it to – run whatever algorithms make a *person*, including an addict. A computer made of metal and silicon has neither a brain nor hormones nor any other allegedly relevant chemistry, *yet it could still simulate an addict*. (Here, ‘simulate’ does *not* mean ‘fake’ or ‘mimic’ – it basically means ‘give rise to’, ‘instantiate’.  A computer running such a program would *literally* contain a person.)

So the prevailing explanation violates computational universality.universality, and with it, the laws of physics.