first off as everyone says dealers dont like giving away free drugs. second they know that most people who buy weed will stop coming back if they find out they are putting shit in the weed and not telling them about it. and if you have ever been high on weed before youd be able to tell something was off. with coke youd feel good but know something was wrong and certainly wouldnt get addicted after one bag. not to mention with that you might be able to tell by just looking at the weed. pcp would probably just scare you out of smoking again. both cost a shit load more than weed and they arent going to be in it unless you are told or the dealer is getting back at you or something. and that would [robably be pcp. as for ecstacy as everyone else has said that isnt smoke