If Canada says "no", as Mexico has, that closes borders north and south.
The FDA is already stopping direct importation (sporadic enforcement won't last for long). Before long, we could have an e-cig isolated North America.
Name ONE country that has approved e-devices? We all know well the names of those that have said "no". Alphabetically, begin with Australia ...
Oh... If Canada says no, we have a problem. But then again, America likes to do the opposite of Canada. (We still haven't gotten over our thrashing in 1812!)
But, it does take just one, first world country to say "YES! We agree this is a step in the right direction" and others will follow. If Canada says yes, then the states will have to follow. If not, we will see a "war on e-cigs" that will be almost as ridiculous as our "war on marijuana".