This drug provides great concentration for a couple hours. However, after a couple hours I predictably experience extreme anxiety, depression, and irritability. It can easily cause you to get into an argument with someone you love because you are so easily irritated and frustrated by anything. The anxiety is the worst. Being a previous smoker, Adderall increases my craving to smoke by ten fold (a habit I have quit and hardly have cravings for anymore). I also find that the drug clouds my ability to think when doing brain intensive work such as programming, math, or even typing. I think that might be related to the dosage though