Yep, and if found guilty of possession, one could still end up with a *criminal* record. Perhaps no jail time, but probation is possible. I don't believe the feds have decriminalized possession... yet, so legal ramifications exist.
With a criminal record, taking a cross-border vacation might prove more difficult too.
No day trips to Albright-Knox?
... no Leafs games in Buffalo?
... no American KA parties?