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.
Hazard: A biological, chemical or physical agent in food, or a condition of a food, that may cause an adverse health effect. (Danger). Hazard analysis: The process of collecting and evaluating information on hazards and conditions leading to their presence, to decide which ones are significant for food safety.azard: A biological, chemical or physical agent in food, or a condition of a food, that may cause an adverse health effect. (Danger). Hazard analysis: The process of collecting and evaluating information on hazards and conditions leading to their presence, to decide which ones are significant for food safety.