Am I the only one that questions the validity of self reported survey data? No, the concerns are extremely well documented, including documentation about psychological and situational factors that impact the results.
Sure, I'm not arguing in which direction the numbers reflect Truth. I'm simply saying I trust teenage self reported cannabis usage about as much as I trust self reported exercise habits. I'm very skeptical, and I don't think we can assume constant variance in self reporting across different time and institutions.
