If you are interested in the effects of psychedelic drugs on the philosophie and litterature of the 20th century( I find these two branches to be complemantary ) and that you havent heard of Jack Kerouac's on the road yet. My advise is for you to check out the beat generation, this rebellious group of writers did a whole lot of experimenting with psychedelics especilly LSD before it became illegal. Go to this site below if you wanna find out more
http://www.rooknet.com/beatpage/