Let me try this another way.
The dealer isn't the cause of drug abuse. Drug abuse is created by the end user. No one shoved mortgages up anyone's you know what.
I would go one step further by saying that US RE was crashing before the drug was taken away.
The drug dealer took the drugs away when it was obvious the addict wouldn't be able to repay the dealer. Something similar will happen in Canada and whatever precipitates it will be (wrongfully) called it's cause. However the real cause is human emotion.
It's a confusion of cause and effect.
Watch for a change in buyer sentiment to precipitate a drop in Canadian RE. It's already starting to happen. You can see it in the comments section of the globe and mail. Two years ago, the comments were all pro RE. Completely backwards from right now. Now people even hate RE agents of all people...you know, another crack dealer. Pretty soon it will be greedy banks. These are all illusions. The cause is in the mirror.