[alephnullshabba]

Larger doses yes, but the opiates being consumed are almost entirely a result of cost/availability. Genuine prescription pills are by far the most desirable choice amongst opiate addicts, but tight control on supply post opiate-crisis has made them practically nonexistent in illegal drug markets.

The extent of prescription opiates desirability is somewhat evidenced by most "street" fentanyl being consumed in counterfeit oxycodone/vicodin pressed-pills. And then of course there is cost--why smuggle 50 packages of heroin when a single package of fentanyl contains an equivalent number of opiate doses and can be manufactured far more efficiently/discretely?

But in general the opiate market is defined by the practical constraints of cost and availability. Fentanyl is a synthetic opioid that has been used in hospitals for decades, but its emergence as a street drug in recent times is the result of precursors and synthesis methodology becoming very accessible