YYZ - No problem 95% of the time. Completely uninterested in talking to me further once they see my Canadian passport 50% of the time.

YHZ - I find these guys ask questions out of sheer boredom more than anything else. Friendliest of the bunch.

YVR - Inquisitive with varying degrees of tact employed. Not much interrogation when arriving from the more developed Asian countries... usually a few leading questions when returning from the less-developed ones. No problem when arriving from Europe.

YUL - I get a lot of flak from these guys. It really seems to perplex them that a young guy would travel as widely as I do without being involved with something illicit. I expect to get sent to secondary here and view any other outcome as a bonus.