Most assuredly. MDPV was a hell of a drug for me. God I miss it. Was using daily for years. Plenty of times I was a paranoid delusional mess but I somehow managed to keep it all inside while going on about my life (working, raising a family, hanging out with friends, etc)
I've been convinced there were people in the attic or in the walls.
I believed many times that aliens were in my house because I could feel their presence, hear them, smell them, feel them brushing against me, etc and I believed I couldn't see them because of their advanced alien technology.
I was also convinced for awhile that my life was being recorded and broadcast worldwide (a la Truman Show). I believed the cameras were too small to see and/or too well hidden to find. I convinced myself that everyone around me was acting like my friends/family and that they knew about my drug habits. They were suppose to pretend they didn't know because that's how they were scripted to act.
I started to believe my job was actually a secret government training program used to train super heroes. I was a super hero in training who's powers hadn't manifested yet.
For awhile I believed my wife and kids were imposters. I believed my wife was actually a man who had undergone a sex change before we met but was just trying to trick me. I believed my children were either Android's or small people who were just taking of advantage of me by pretending to be my kids.
Plenty of other things I can't recall ATM. Its amazing I kept all those delusions inside especially considering how intense and long lasting they persisted. It's even more amazing that I still have my family and I still have the same job (although I did leave for awhile at the end of my use due to "health reasons" lol but they had no problem hiring me back later on).
People close to me knew something was weird about me but I kept my shit together well enough on the outside. Not so much on the inside.