Most vices have little or no nutritional value and they can be stored without the need for rotation.  An alcoholic will pay dearly for more alcohol.  The same for any of the other vices.

 

Why do you need to trade.  You and I cannot think of everything you need to survive.  If you are faced with famine it may last longer than your food supply.

 

Your neighbor may have fruit or nut trees that would expand your food supply or break the monotony of eating dried food for prolonged periods.  His vice may be tobacco and he may not have prepared for the emergency by buying up a supply of tobacco.

 

Buy some of the vice products listed above for trading or for your own use.  It is better that you use them for trading, however if you need coffee in the morning then you should have some put away in your emergency supply as well as nondairy cream and sugar.

 

Right now the easiest vice to save for trading is sugar.  It can be found almost everywhere and at low cost.  One abundant source of sugar is at almost every restarurant and fast food establishment.