any psych will tell you this. stimulants lose their effectiveness over time. your brain adapts, more is required. pretty soon you cannot function without it. br

any psych will tell you this. stimulants lose their effectiveness over time. your brain adapts, more is required. pretty soon you cannot function without it. breaks are important, as-is using them as a single tool in a complete toolbox of strategies. it is not a magic bullet, although anyone who has been on it a month or two will lead you to believe that it is.