I smelled marijuana coming from the air duct

I was working at a modern office building last weekend and it was the night shift.

The entire building was supposed to be empty.

I used a set of keys to let myself inside to clean. My uncle told myself and others not to go to the address alone, however I couldn’t find anyone to help with the cleaning job, so I had to go by myself. I locked every door behind myself and others when I entered and left a room. I was cleaning one of the Executive offices upstairs when I started to smell a entirely faint, however distinct smell, and no smell certainly smelled care about marijuana. I started searching all over the room and the smell seemed to be coming from the air duct. I did not see any visible smoke, so I really thought I was going crazy. It had been a entirely long day and it seemed sufficient to myself and others that I was hallucinating. I went to another office to wash the desk and the windows and I smelled the same marijuana smell from earlier. This time the scent and smell seemed to be much closer. The smell was coming from the air duct, however I could see smoke. I yelled hello down the air vent and I heard some voices whispering. I stayed in the office and I turned off all of the lights. I was a little scared until I saw more than one youngsters walk past the office I was cleaning. They blatantly did not suppose that I was there. I opened up the door and surprised them. One of the gentlemen snatched the office keys from his father. He was using the office space as a clubhouse at night. The kids swore they would go straight home if I did not call the cops.