I'm reading the Chris Claremont/Frank Miller trade paperback Wolverine.
I'm familiar with many of the basic X-Men characters, although mostly from movies, TV, and video games, rather than the X-Men comics themselves (although I've read a handful).
On the last page of the reprinting of The Uncanny X-Men #172, Rogue insists on joining Wolverine.
When Wolverine asks about the poison (Viper had just poisoned all of the X-Men in Japan including Logan and Rogue, with only Storm avoiding it). Rogue responds by saying:
Ah'm half-alien, remember? It wasn't so effective on me.
What does she mean by this? I thought Rogue's parents were hippies.