No matter what you start, your concentration is on the project at hand—not whether it's time for a drink, a toke or a fix. You remain focused on the task until it is complete or until there is a logical break in the work and resume with full concentration afterwards. Even after lunch, you are cold sober and feel totally fine about it. You're able to hold a job down and no longer call in sick due to a serious hangover. At day's end, you get a buzz off a job well done.