Cannabis is illegal in most countries. If you try to travel internationally with any amount of cannabis in your possession, you could face serious criminal penalties medical marijuana broadway winnipeg both at home and abroad. You could be denied entry at your destination country if you have previously used cannabis or any substance prohibited by local laws. You could also be denied entry to other countries in the future. The minimum legal age in Ontario for alcohol, cannabis and tobacco is 19 years of age. Cannabis is now legal in Canada for people 19 years of age and older in Ontario. It remains illegal for those under 19 in Ontario. Begining October 17, adults 19 years of age or older may only legally purchase recreational cannabis online through the Ontario Cannabis Store website.