Dollhouse 1x07 "Echoes" is a really great drug related episode! The whole episode is about drugs, and what they do to our body, and it's a really hilarious and creepy episode and I recommend it strongly. I really think that you would enjoy it, especially if you watch it stoned because the episode is so funny and weird. Here's a quote from the start of it:
>Topher: Could be phases, could be... a little thing I like to call body chemistry. We're all our own little cesspools of hormones, enzymes, chemical reactions. It's the same as any drug-heroin, cocaine, caffeine, how your body reacts depends on a multitude of indefinable factors.
>[Topher conversationally points to Adelle]
>Topher: You snort horse once-don't like it; you go back to your organic tea, have a nice life. I do it once-Whoo! (chuckles) I'm doing two bags a day for 20 years.
>[He points to Clive]
>Topher: One toot for you, adios, amigo. That's what's so exciting about drugs!
>[He stammers for a bit in excitement before he gets a look from Adelle]
>Topher: Not that I'd know. We do biweekly drug tests. Just pure scientific observations.