FYI, it is a violation of board rules to talk about illegal drugs.
No, I just read the rules, because I also thought what you just said was the rule. In which case marijuana could be discussed my many people since it's legal in many areas. The rule actually say that you can't talk about using an e-cig as a means of ingesting any materials other then nicotine. Which means you can't even discuss using it to vaporize a certain class of beverages that you need to be 21 or older to drink in the USA.
However, since he's talking about a flavor, he's not talking about ingesting the actual substance, but merely an artificial flavoring intended to taste like such, because many people love the taste alone.
I too would be interested in a cannabis flavored e-liquid, and since it has been several months since this thread was active, perhaps someone now knows of such a flavor which has been released.