Study Permits and Drug Testing?

[eddievicios]

Hey guys I am kind of new in here but I have a serious question to ask all of you. First of all let me explain you my situation, I am applying for a Canadian Study Permit due to I am going to UBC to study next September. I am from a country that requires medical examination. My first doubt is: Is it true that they do drug testing in this medical examination? If so what should I do to pass the test? Has anyone been in a situation like these before? I still have about a month and a half until I do the medical exams and I have stopped smoking for a while, until the tests at least. I am a regular smoker, I smoke on weekends and during the spring break and eastern holidays I did smoke a lot, at least half of the days. Does anybody knows how long does for sweet ganja to leave your body?
Thanks, all replies are welcomed