Of course there are...though he didn't seem to be a junkie so much...despite his role on TNG.Well, he did die of complications from AIDS....
In fairness, I'll point out again there's more than one way to get HIV/AIDS, and even then there are several different possibilities.
I don't care if he was gay or not...it was Ground Zero time for AIDS back then. It had just been finally isolated and named in 1981 or so. It's only a coincidence that it became prevalent amongst homosexuals back than...it could have just as well have been a mostly straight affliction. And of course, unchecked blood transfusions and shared narcotics needles did nothing to slow the spread.
But it is what it is. For what it's worth, I was personally a bit shocked to learn Jm. J. Bullock was gay (I mention him as a sitcom actor working around the same time TWOK was in release). Still don't care that he is...and I'm pleased he seems to be managing his affliction quite well.