You heard of the Buzz Lightyear of Star Command episode that was basically an anti-drug PSA? And it got banned FOR being about drugs in the first place. Talk about your stupid. Sounds like the same thing, only Mira thought it would help her capture Zurg better. So basically, not only was it an anti-drug episode, it was an anti-steroid episode as well. And again, it got banned... duh-oi!
My personaly favorite anti-drug episode of anything was Bravestarr. Now, I got this "Best of" set cheap, and I was thrilled to see that episode was on there (I heard of it before), and I was ready to laugh at the thing, thinking it would be campy. HOWEVER, it was very dark, it showed characters completely out of their gourde, acting completely, frighteningly erratic, and spoiler, instead of the happy "Aw shucks, I'll just give up and become a good little twerp the rest of my life" ending, the kid DIES. It was very powerful and realistic for a show that's a sci-fi western. I can't say it wasn't preachy, but it didn't beat around the bush and have the "Everyone throws back their heads and laughs at someone's stupid behavior" ending (Cough cough He-Man)... though, I will say, I've yet to see an episode like that. Really, that was Filmation's best action series for avoiding the 1980's laugh at everything endings.
I remember there was a Pup named Scooby-Doo episode where the bad guy wither used or sold "drugs" (I'm not lying, they said "drugs" in a generic, nonspecific way). it was NOT important to the plot, it was never shown, and it was only mentioned in passing for NO reason, and Scooby basically just uttered "Rugs? Rrryuck!" That's NOT how you do it.