It's gotta be on LOW heat brotha..
I tried simply medium-low heat and the weed burned right away and I could smell that burnt smell and saw it was black and it was steaming (it should never create smoke/steam..) and realized I wasted the weed..
I still got a little high though but not as high as I could have been if I just set it to low heat.
And just use butter. Don't bother with milk..