It only happens to me the first time I smoke after taking a long break. After the high sets in, my heart is fluttering and I get real paranoid. Always think the cops are going to walk in on me or whoever I bought from was really a cop. But once I realize what's happening, it takes me about 5 minutes to get back to normal and I'm fine until my next break. Weird. I couldn't imagine experiencing it EVERY time I smoked. I'd have to quit.