Cigarettes and alcohol are always good ideas for SHTF.
I did some pretty dangerous trips to get cigarettes or tobacco in my SHTF time, i smoke tobacco after I cleaned it from dead worms from it (I guess very old tobacco) , even those tobacco roots (actually simple old tobacco branch) had value, I use to chop it for hours, make small pieces or powder and smoke it.
Smokers will understand, when you do not have it, it become priceless.
Tobacco rolled in newspapers was quality stuff :)

Cigarettes were sold-traded by piece, we smoked one cigarette in circle, 5-6 of us, one smoke (puff) each.
Yea, I there were time when I would took cigarette instead of food, even I was hungry.