I am 16 and getting a medical examination soon for a visa to Canada, and have not for a very long time and do not plan on smoking marijuana again, I hang out with people which smoke this but i don't intend to because I wouldn't want to risk in anyway my chances of a new opportunity.
Could the THC which is found in hair, or other compounds which are found in urinal tests or blood be found if it was second hand?

(Please no immature comments) Thanks xx