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.
SECTION I. OVERVIEW OF BIOLOGICAL, CHEMICAL, AND PHYSICAL HAZARDS. In a HACCP system, a hazard is defined as a biological, chemical, or physical property that may. cause a food to be unsafe for human consumption. This guide is a reference for plant HACCP. teams to use in their hazard identification and analysis.