Regarding pipes with residues of other drugs, that totally seems feasible with fentanyl/opiates. When I use google, I do not see reliable sources (eg dancesafe) that describes pot is floating around that is intentionally “laced” with synthetic opiates.
When I was younger, my peers and I sometimes had a pipe that we used for what we believed to be opium or opium/hash mix (usually scored at the SLC OR shows), and we were responsible enough to make sure people knew that the pipe likely may have residual opium when it was just being pack with pot.
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