Finding side effects of quitting smoking only for 12 hours. What more after a few days? Well, yes it is more remarkable to note the improvement of your senses, particularly smelling and tasting. You will begin to breathe easier and cleaner and your smoker’s hatch would be gone, however, you may still be coughing every now and then. See? For only a few days, you have lived a clean life, and have reduced the expenses of the luxury. You will also be free from the addiction you cannot even admit to yourself. While withdrawing yourself from smoking cigarette or tobacco, you may start to feel worse for some time. But that’s while your body is repairing the damages of your smoking habit. Healing is not something that completely happens overnight, not even a small blister in your finger. It does not happen immediately, but it still happens for a few months.