I was at a friend's apartment complex when I noticed a thick haze coming out of an apartment down the hall. At first I thought it was smoke but there was no smell and I wasn't coughing when breathing it in. There was however bitter taste in the back of my mouth and some other residence who noticed the haze described their mouth and tongue burning. My initial thought was that was that it was a meth lab. However, the descriptions of the effects didn't match ours. If anybody has any idea what might have caused this I'd appreciate a notification. Thank you!