The Perfect High is very long, so I won't copy and paste it all here (see the link before), but here are the first lines:

The Perfect High - by Shel Silverstein

There once was a boy named Gimme-Some-Roy...
He was nothin' like me or you,
'cause laying back and getting high was all he cared to do.

As a kid, he sat in the cellar...sniffing airplane glue.
And then he smoked banana peels, when that was the thing to do.
He tried aspirin in Coca-Cola, he breathed helium on the sly,
and his life became an endless search to find the perfect high.
.....