Age Ole Question: Is this Plume or Mold????

[The Dakotan]

Step 1: Wipe it off in your mouth
Step 2: Taste it
Step 3: If it tastes like mold, it's mold.
Step 4: Repeat.

Plume doesn't get that big and is usually spread more evenly. But, as Mark said, just wipe it off and smoke it. No need to bother a vendor with that little mold.