As a non smoker, I stock cigarettes since I suspect that smokers would become desperate.
Any popular brand will do, simply ask your local shop what is popular.
They keep several years.
I rotate stocks by giving them as Christmas presents to friends and family who smoke.

In the event of any serious and very sudden disaster I would buy more cigarettes, since they are the only widely used article of which I can carry say £1,000 worth.
I dont drive, therefore last minute stocking up is limited to what I can carry.
I already have fair stocks of food, water, fuel, clothes, blankets, tools and other supplies.
But if I had reason to believe that money was suddenly going to become worthless, I would quickly draw the maximum permitted from ATMs and buy as much food as I could carry, and spend the rest on cigarettes.