Thanks to all who responded. I am keeping my guard up. I keep thinking, "something is going to happen", I just don't know what or when and your experience and advice may help me to cope with whatever it is. I gather after reading the comments the challenge for me may be psychological rather than chemical or physical. Many times over the years I have thought about quitting for various reasons but never saw the need to quit. For me it was kind of the same as going on a diet; "I'll start tomorrow" but tomorrow never came. I was also concerned of the effects of quitting and how I would handle it; most of what you hear about people quitting is scary stuff. But so far, so good. NOW, if I can just lose some weight!