Henry, good decision. I can remember finals week, studying with a giant fatty in my lip. Looking back all I can think of is how moronic my idea that it somehow helped me concentrate was. That was 11 years ago for me. I am slowly beginning to realize the depth to which dip penetrated my thoughts, actions and my personality.
Posting roll does help. I've only done it twice now, but I can see the benefit. Stick with your quit.