I snorted 20 mg Kanna extract twice a day, in the beginning it was mainly the rush effect that I noticed, but gradually it changed. After about two weeks of daily use, I hardly felt a rush, but I noticed a lot of difference in my daily life. I have always suffered from panic attacks randomly, usually followed by a very somber and listless day. But Kanna seemed to make that disappear for good. Even in a very stressful time (an important exam week, which usually creates additional anxiety) I stayed cheerful and upbeat, even my concentration had gone ahead by leaps and bounds. I noticed that combine caffeine with my concentration helped even more, and I came without significant effort by the exam week. I would recommend trying this product to anyone experiencing anxiety.