Never let yourself "just one puff". Especially when you want to stop trying a behavior that you have had for many years, your head can occasionally give ideas. Don't allow yourself to provide in the concept that just one single cigarette will not hurt. It will hurt, and it may indeed keep you from having the ability to stop at all. Anytime you feel tempted to have a puff, look for Affordable Electronic Cigarettes and Accessories that can help you avoid it.
Your choice to quit smoking requires a huge lifestyle change, thus be sure you are ready for the determination before you drop into it.