Cannabis has been steadily increasing in potency for the last 20 years. Some strains can produce buds with upwards of 30% THC. If you haven't smoked in a long time, this can indeed be very psychedelc. I smoke every couple weeks, and if I took 8-10 hits of weed I would be very much tripping. It only takes 1 or 2 for me to achieve a psychedelic visionary headspace.
Also a certain sensitivity to psychedelic headspace is generated by smoking DMT that does not happen with other psychedelics, or at least not to the extent it does post-DMT. As DFZ (DF0?) said there are multiple threads about this phenomenon exist here.
I think these things combined with the possibility (a very real possibility) of unused residue left in your device which delivered a dose is responsible for what happened.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*