There are possibilities that some impurities can be toxic. Here where people smoke crack or whatever on market one day there was a man who puffed some bad crack, started coughing, spitting up blood, and vomiting only to die shortly after because if the bad crack hit. Street quality drugs are super risky and add a whole extra level of risk prescribed and quality controlled meds.I highly doubt methamphetamine is to blame. It was recently ranked the second safest illegal drug after marijuana. But, although it is hard to overdose on at typical recreational dosages, doing so is not impossible. A teenager swallowed a large amount last year at the border, started screaming uncontrollably, and then died. So, yes, it is an unpleasant way to die.