Actually our bodies have specific receptors because we produce these substances; endogenous Opiods, cannabinoids, serotonin, dopamine , ect... Recreational drugs are just most selective in those receptors and/or stronger, but the receptors in our brain and body are originally made for our own chemicals.
While I dont believe it was an original human need, I think evolving alongside psychoactive substances for so long has changed our brains to enable us to experience more pleasure from psychoactive substances.
I believe this has made changing your perception, while not a BASIC human need, a reward/pleasure 'drive'.
good thread. i think you might be right in a way, everyone strives to 'feel good' off of something. be it drugs, art, exercise, even food. no one seems to be content without some form of escape.