Canada’s new marijuana rules came into effect October 2018. Although many States are onside with this new way of thinking, cannabis is considered a narcotic federally and those rules are very strict and harsh.
US immigration lawyers have warned Canadians that they can be denied entry to the US, or barred from the US for life, for admitting they smoke cannabis to a border agent. US officials say they haven’t changed their questions after the Canadian laws came into effect. But they may ask further questions.
Those involved with growing or distributing legal marijuana in Canada may be considered “dealers” or “traffickers” under US laws … even when used for medicinal purposes.