Continuing my discussion of health and bar exam study, I offer the following suggestion: if you are thinking of quitting a habit during your bar exam studies, don't do it. While I do not condone bad habits such as smoking, you have too much at stake during these crucial months to undertake such a huge lifestyle change.
I think it was Richard Freer in a Barbri lecture that commented if you smoke pot, do not decide to quit leading up to the bar exam. You will not be focused on the task of studying for the bar exam. You will be thinking about how you miss smoking marijuana.
Likewise, the months leading up to the bar exam are not the time to enter into a new relationship with a significant other or break up from someone. A positive mental state is important during this period.
A singular focus on passing the bar exam is imperative. If smoking cigarettes help you to concentrate on lectures or study outlines, then continue to smoke. You can concentrate on kicking the habit after the bar exam. You can make a stronger effort to quit after you take and pass one of the most stressful exams you will ever take.