A Message Sender / Stamp design

For sending cards and letters, licking stamps without using glue is very common. However the taste of postage stamp gum is not very tasty normally.

Stamps are able to have more potential functions, not only for postal rates. Is that possible to design a sort of stamp with particular tastes? Taste and flavour can be used to reflect local products. For instance Winchester strawberry, Bristol lemon or Edinburg apple. Then stamps can be used to submit more messages visibly and invisibly, as “a message sender“ essentially.