“When multiple substances are illegal (or legal but onerously taxed), it’s no surprise to find criminals selling more than one of them”.
I’m maintaining “legal” marijuana is expanding the use of worse drugs—and I even forgot methamphetamines!
Nothing you've posted supports that contention.
“The CAC says the lackluster progress in displacing the black market is due to a combination of high taxes, local bans on pot shops, licensing bottlenecks, and heavy regulation.”
Like I said.