If you're an adolescent, if you are pregnant or nursing, if you are predisposed to heart disease, stroke, or psychosis, if you use heavy machinery frequently or

If you're an adolescent, if you are pregnant or nursing, if you are predisposed to heart disease, stroke, or psychosis, if you use heavy machinery frequently or work in government, then occasional cannabis use may not improve your quality of life. It's not hard to be a perfect candidate.