Weeding out the solution

I knew I was going to look like a fool unless I backed up my story.
"Okay, I'll show it in action." I instantly thought up a harmless wish. "I wish there was a 20 dollar bill on the coffee table." The powerful light filled the room, and when it subsided, a 20 dollar bill rested on the coffee table. To continue my example, I said "I wish there wasn't a 20 dollar bill on the table." As expected, nothing happened.
"See? You can't undo a wish" I restated.
"Okay, I see what you mean," Chad said, "Let me do a little test." I handed the rock to Chad. He observed the rock for a moment then held it triumphantly in his hand.
"It's cool if I make a wish, right?" He asked. I was really glad he asked, thats what makes Chad so trustworthy. I told him it was all right with me.
"Don't do anything retarded." Julie broke in. Chad smirked at her and began his wish.
"I wish I had a pound of the most potent bud in the world." He declared. We all glanced away, and when we looked back, a giant amount of bright green, crystal covered marijuana was sitting on the table. Chad was ecstatic.
"Holy shit, man! This is great! Take this rock from me right now until I calm down." I did as he said so. Right after I freed his hands, he grabbed a small pipe near him and packed a little bit of the new weed into it. He took a small hit and slowly sunk into the couch.
"This....is so awesome." He muttered. He then resituated himself and handed the pipe to me.
"Julie, hold the rock." Chad said.
"No, really, I don't smoke. Especially when I have this much power." I hesitantly declared. This did look like the time to smoke weed, if there was one. It was only 1:12pm, Karyn wouldn't be awake for awhile, I had nothing to lose. I gave in, and grabbed the pipe, making sure that Julie had the rock, so I wasn't stupid with it. I trusted her, after all, if she could keep stoner Chad in line, she could probably handle the rock.
I lit the bowl and inhaled. It tasted suprisingly good, until the harshness made me cough until I teared up. But once I got the tears out of my eyes, I knew I was completely stoned. Not only do I not smoke weed, but I just hit the supposedly greatest weed in the world. I was completely baked. Just as I was starting to feel comfortable, Julie said "Well, now that I have the rock..."