Just to clear things up
Yellow smoke is the cause of smoke becoming extremly dense, from usually torching the bowl to hard real fast or pulling for an extremly long time. Both result in more wasted THC/CBD being wasted and smoke being harsh. Best is to take slow, mulitple hits to get the most outta your weed.
Yellow smoke can also be the cause of many other things. Burning plastic, or such when smokng from a shitty homade device, built up resin, lots of cloryphl sp??(fresh buds),...toxic chemicals..
Your weed has no tar on it what so ever. Just possible toxic residue and plant matter.
Edit: Dude you have to be underage, com'n!!!