How long does marijuana stay in your system of you smoked it once? Someone who smokes occasionally-or for the first time-will  likely test positive for 1-3 days afterward, according to a review  by the  National Drug Court Institute (â¦ NDCI).ow long does marijuana stay in your system of you smoked it once? Someone who smokes occasionally-or for the first time-will  likely test positive for 1-3 days afterward, according to a review  by the  National Drug Court Institute (â¦ NDCI).
Chemical hazard. A chemical hazard is a type of occupational hazard caused by exposure to chemicals in the workplace. Exposure to chemicals in the workplace can cause acute or long-term detrimental health effects.
Definition: An explosive chemical is a solid or liquid chemical which is in itself capable by chemical reaction of producing. gas at such a temperature and pressure and at such a speed as to cause damage to the surroundings. Hazard categories: ï· Unstable explosive. o Label pictogram(s): o Label signal word: Danger.