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.
Several factors can influence how a chemical will behave and the hazards the chemical presents, including the severity of the response: 1  Concentration of the chemical. 2  Physical state of the chemical (solid, liquid, gas). 3  Physical processes involved in using the chemical (cutting, grinding, heating, cooling, etc.).