Weed always either gives me a panic attack or very close to one and I don't like it. I don't smoke weed, although every few years I'll try it again just to see if things have changed. I also had panic disorder and agoraphobia from it for a couple years and it was hell to get over. Getting over that was the hardest thing I ever did really, even moreso than making myself talk to people, not act so shy and weird, and stand up for myself. I finally got the right meds for it, Xanax daily but I never abused it and rarely took the entire months worth in a month, I'd take it daily but less than the amount prescribed because he said I could do that. I was on it for close to two years, one of which was panic free but I was on such a low dose and didn't abuse it and was afraid that the low amount was the only thing keeping me from panicking that they let me stay on it until I was ready to come off. So, I don't know what to tell you, except that I get panic from weed too.
Although about the laced weed, I'd think you would know and would pay more for it unless somebody got something mixed up somewhere. I heard all those stories about people killing people with laced weed back in the 70's but everybody I know who got something with something in it, paid extra, like when they paint a blunt with codeine syrup and all now. I'm not saying it's not possible, because it is, but I can't see slipping somebody something worth more money on purpose as a joke or to be mean.