Horwath
Legend
Get enough of it and it could be quite valuable in a desert; increasing the amount of water a thousandfold (or whatever a drop to a waterskin is) would be incredibly useful.
Or of course, be like my players and attempt to drown someone by feeding them a cookie with the stuff baked in.
I would RP that as selling cocaine. It will react with mucous membrane in lungs and drown the victim.