Food does not stay in the mouth for long before passing in to the next area. Food is broken down somewhat in the mouth by saliva and chewing before passing into the alimentary canal.
just try not smoking
After smoking crack, it can be detected on a mouth swab for approximately 72 hours. This varies from person to person, however.
A bit distasteful, but definitely not deadly as long as you are not smoking at the time.
lung cancer emphysema mouth cancer throat cancer
19 to 36 hours