So many musicians used heroin. Both Stan Getz and Philly Jo Jones said they used heroin because it gave them the energy they needed to cope with the demands of playing.
Robbie Robertson says Richard, Rick and Levon’s heroin use is one of the reasons The Band’s music suffered and contributed to his decision to leave. Of course, RR had his own drug use problems. Seems to go with the territory.
This is how Jerry Garcia described heroin and drugs in general- “It’s one of those places you turn with your problems, and pretty soon all your problems have become that one problem. Then it’s just you and the drugs."
I haven’t heard of Evan Johns and looked him up--a musician’s musician, who has played with many good musicians.