I despise people who spray weed like that, i would spray them with acid. It's so fucking annoying. It's not worth it anyone out there who has been jipped like that, chalk it up to experience and don't smoke it whatever you do. Really the only way you can fully know if its sprayed is if you grow it yourself pretty much, otherwise that's just the risk we're forced to take since it's illegal. Thankfully i havent had sprayed weed in years, hopefully i never see it again. You can tell its sprayed if you're smoking a spliff and it wont ash. If this happens i would pay the dealer a little repeat visit with a very sharp implement in hand.