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.
A chemical that is determined to be hazardous can be either a physical or health. hazard or both in some cases. A chemical that poses a physical hazard is one. which there is scientific evidence that it is a flammable, combustible or explosive. material, compressed gas, organic peroxide or an oxidizer. These are chemicals. that could cause damage to the physical surroundings through fire and/or. explosion.