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.
Chemical Hazards. Chemical hazards, such as alcohol, ammonia, bleach, cleaning solutions, dishwashing liquid, polishes, and solvents, enter the food supply because of simple human error. In 2008, for example, a foodservice employee forgot to rinse the sanitizer from a beverage machine before adding the beverage.