Tigger, An Addict?

Today, I caught Tigger licking the glue off an envelope. It set me wondering again, whether he could have been a substance abuser in a past life. As recently as a few months ago, Alex had a sticky board on the wall next to his study table, on which he pasted his notes etc. Tigger would lick the exposed areas, i.e. the sticky bits of the board. Glue is also not the only substance that Tigger likes licking. Whenever he comes across any photographs, he would lick the stuff that makes up the glossy sheen of the photos. And no, he doesn't seem to get a high from all that licking.