I have smoked a ton of pot in my day. That blunt you smoked was laced. It could have had PCP, formaldehyde, opium, exotic herbs, or any other number of things but your blunt was laced, I swear! My ex's brother had a big massive panic attack but he didn't hallucinate or hear voices. Look into the effects of PCP and you are probably going to realize that is what it was. One time I had a joint with wormwood and I saw interesting things in existing patterns. One time I was smoking a joint and my lips felt numb and my friend came home and said "who's smoking crack?" It happens to most pot smokers at least once.