This can be dangerous to the body, causing extra lung damage, unwanted drug affects, Addiction, restlessness,
psychotic episodes, over emotional. You should also consider that you are still inhaling smoke (and/or if "spun" with tobacco) it still damages the lungs and enters the body systems (blood stream, urinary) it may take 3 months for the cannabis to be completely gone from your body so if you are working in a strict, dangerous (contruction etc.