After having Piper as a partner for almost 400 hours, it looks like she is starting to crave excitement.
Today, after clearing out the BADTFL on a quest, I caught her huffing Jet. I hadn't given it to her, so she must have picked it up from the Raiders.
It's the first time I've seen something like that. I hope she doesn't get into the medicine cabinet back at the Red Rocket; I've got Psychobuff and Yao Guai steaks in there!