Don't worry about cancer from smoking.
They look like C Rations, they are still available? Where?
Ah C-rations - I bought a couple of boxes on e-bay recently to show my kids what we ate every day in Vietnam 50 years ago and I was disappointed to find that the main meal in each had burst. Unfortunately, most of the existing supply of C- rations have outlived their useful span.
At least I could let the kids see what John Wayne crackers and “s**t discs” (Tropical chocolate) taste like.. Yeesh!