Okay, so you need to be told this?
In Colorado, one can buy a 6-pack and pack of cigarettes for under $12.
In British Columbia, the same would cost about $25 because of exorbitant "sin" taxes.
What on Earth would make you think that it would be any different with weed?
NO ONE will pay $30-40/g for weed but that's what it will cost with provincial and federal taxes included.
Being charged with buying black market weed will entail severe penalties; much worse than it was buying it as a banned substance that no one really gave a shit about in the first place.