I don't think that trying marijuana is a contraindication to transplant...although i think abusing it might be. Like so many before said, they want to make sure you will treat these lungs with care. When i was evaluated for my transplant i was in my junior year of college and partying like no other. So when the "how often do you drink?" question came up, i was honest. My doctor was taken aback wtih my answer and told me i needed to significantly cut that back. So i stopped drinking completely so that I would be at my healthiest for the transplant. so i think you should be okay.