His "drug legacy" is mostly exaggerated, love to do that.
He was sober through high school and even through college fraternity life. His first drink was a toast at his wedding. He was an All American kid. He was an Olympic alternate in wrestling. He volunteered at Stanford hospital to participate in CIA experiments that included (legal) LSD. They wanted him because he was such an academic and physical specimen. He did partake in LSD outside of the experiments with his friends for a while till it was made illegal. He was caught with someone who has marijuana and did 6 months in jail. After jail 1967 he came back to Oregon to settle down on a farm and raise his family in a simple way.  Almost everything else you have heard is exaggerated hearsay that sells books and makes for better stories.
...trust me!