What does “Down Smoke” mean?Secondhand smoke, inhaled either from someone's lit cannabis or as another has exhaled it. Lengthy exposure to down smoke in an unventilated room (also known as hotboxing) can result in a contact high, but it will not be as strong as one achieved through direct consumption. However, it's not possible to get high or test positive for THC from catching a whiff of someone's joint, or from being with a smoker in a ventilated room.
Example usage for Down Smoke
“I didn't have any myself, but I caught a bit of a buzz from the down smoke after my friends hot boxed the car.”