Yes, it's normal. That's why everyone talks about bad trips. When this drug first entered the illegal market nobody took it without a guide, then it became just another drug. Usually it's cut with speed, which makes the high longer but also makes it harder to come down from a bad trip. I was young when this drug was young, and most people handled it fine. The ones I met who didn't usually took a lot of it at one time or mixed a lot of drugs together at one time. Also, a lot of people many on this website, had their first anxiety attacks while stoned. Whether or not it evolved into a chronic problem, and this is just my opinion as nobody really knows, is what's locked up inside of us that drugs sometimes bring out. I'd probably not smoke weed anymore, or at least not for a long time, because it might make you feel disoriented and that's what an anxiety attack feels like, and it might push you inside yourself in a way that's not fun anymore. Most likely, you're afraid of having an anxiety attack again. You had a bad experience and you're expecting more of them whereas others might be better at just writing it off as a one-time thing. If you feel this is getting to be chronic thinking, you might consider therapy or try learning some relaxation techniques such as meditation, exercise -- you know what they are. But another thing to consider is, why did you feel it necessary in order to have fun to smoke every day? If you got drunk every day, you'd probably wonder about that, right? Pot should be fun, not necessary. Anyway, most likely, no permanent damage done, if that's what you're afraid of.