It is a good way of distinguishing it.
Stimulant withdrawal. What other legal and common stimulants are people often addicted to?
-Energy Drinks (though, I wouldn't recommend this, as they are potentially dangerous)
-Sugary Foods. Sugar and Caffeine are stimulants after all.
-While not that common, there is a product that is essentially a cup of coffee. As it contains just as much caffeine in a tiny cube. It may not be safe, as it is not recommended for those under 18.