Yeah, I can see that now after reading through the trip reports on Erowid. Surprisingly though, there were only like 6 or 7. But they were indeed half and half- some people absolutely hated them and just flushed them down the toilet and said "good riddance", while others were raving about how awesome and amazing and enlightening it was. Reading about the negative symptoms though, I'm thinking you're probably right, and pipes were the culprit.
And in the long run, yeah. I've been taking xanax for a year now, it's prescribed to me, so I'm a little too far gone as far as benzos go regardless lol. I was mostly referring to the horrible anxiety some people get when they're coming down from a stimulant... or if they need to stop a bad psychedelic trip... in which case, I'd hope those people would only use the benzos sparingly, not enough to get dependent or addicted to them.
No worries about me though. I never plan on touching another stimulant in my life. They just aren't my cup of tea anymore. As I got older, my attention shifted from stims to depressants... opiates are my vice nowadays.