We used to receive something called SP PACKS.
Never been a smoker, but I remember they had cigarettes and chewing tobacco candy and shaving cream, razor blades ...?
Used some of the chew for night ambush, when you gotta stay awake.
A small bite of that crap, and I couldn’t close my eyes if I wanted to!
The regular infantry units got those. I was in SF. I carried a cartoon of Pall Mall in my INDIG ruck. It was gone the end of the second day. By noon at the latest on day 3 I was bumming Ruby Queens from my yards.