Dr. Hamilton (Joe Morton) uses the meteor rock to resurrect the extinct, "Nicodemus," a flower that causes people to lose their inhibitions.  Jonathan, Lana and Pete all fall victim.

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Smallville Season 1 Episode 15 Quotes

Clark: Ever since Whitney's father's been in the hospital, there's been a no-fly zone on Lana.
Chloe: You know, Clark, there are other girls out there that don't require crossing an emotional minefield.

Lana: I just wish I could remember what happened. Sounds like I got a little out of control there.
Clark: You spoke your mind and you did what you wanted. Kind of an alpha Lana.
Lana: I couldn't believe what I was wearing.
Clark: I kinda liked it.