Some smokers quit and never feel compelled to smoke again, whilst others feel they need constant vigilance to prevent resuming their smoking habit years after they quit. Usually tobacco cravings will often begin within the first 6 to 12 hours after quitting. Those people who have to fight the strong urge to smoke again are comparable to the alcoholic who lives from day to day fighting their addiction. In these instances cravings can continue for a while after quitting. This often happens when some part of the non concious mind does not want to quit smoking and a further hypnosis session may be needed. If you smoke at a particular time each day or in certain social situations then you are more likely to have cravings exacerbated by these factors.