How Canada interfaces with the rest of the world promises to be a bit screwy. For just one example, consider airline staff. Some Canadian airlines have already banned employees from using pot. Obviously, the general public doesn't want to fly with pilots that are high in more than one way. These airlines also have to operate in countries, like the U.S., where their employees could be detained or expelled for even adm…
How is the US travel situation with Canada any different to someone coming from say the Netherlands? Regarding pilots, Transport Canada, the governing body over federal aviation regulations has explicitly come out and said use of Canabis is valid grounds for a revoked medical certificate, which is required for any pilot to fly. While the airline rules are one thing, this is a very serious implication for pilots.
Cannabis is not explicitly mentioned in the regulations and is lumped in with any drug, legal or not, that can cause impairment.