The simplest analog, and perhaps the inspiration for the CBD variety, is the breath strips that became so popular a number of years back. Breath strips and CBD strips are both small squares of edible “paper” that have been infused with any of several ingredients. In the case of the breath strip, it’s menthol, eucalyptus, and other components that make your breath smell good.
In the case of the CBD strip, it’s the cannabinoid cannabidiol (CBD). Regardless of what’s included in the strip, the “paper” itself is extremely water soluble. That means that is will dissolve quickly when it comes in contact with water—in this case, the saliva in your mouth.