Hello, and welcome to ECF !
I believe your "source" is incorrect regarding the "selling" legality. Health Canada (a federal regime) is NOT allowing the sale of e-cigs or nic juice to date, and are still clamping down on vendors who ignore their announcement made in 2008. They still maintain that electronic cigarettes are an unapproved drug delivery medical device needing market authorization.
If you have new news please share facts, as many, including myself, would absolutely LOVE to hear that its so.
As far as in Airports ? I've had no issues vaping openly with security in "general" area's in Ottawa Int'l, but once your thru the customs check its a no go. And was asked "not to vape" on the flight.
VapeOn,
Greg