Meh, the vast majority of classical or jazz musicians don't have any time to take drugs -- because they have day jobs.

Heroin, in particular, seems to get a lot of jazz musicians.

There is a reason why most musicians will tell you to stay far away from heroin even if they are quite the partakers of almost everything else.

I've been a performing jazz musician for 40+ years. I've never heard of or observed heroin use, never been offered it. I doubt that jazz musicians are more or less likely to partake, than the population in general. Alcohol is a big problem.