There is something called the habit loop that explains addiction well. It’s not only about willpower. There is a cue or trigger which makes you crave the cigarettes. You need to figure out what that is. For example, your trigger could be anxiety. The routine or behavior would be smoking. The reward is a relief from that anxiety. It’s not necessarily that you want cigarettes but that you want the reward (relief from anxiety) when the trigger happens. So to quit smoking you must identify the trigger and reward. A journal helps with this. Every time you crave cigarettes, note the time, your emotional state, and what you are doing. Often times you will find an obvious pattern and breaking that pattern becomes easier when you recognize it. The next step is to find a new routine/behavior to provide you the same reward as the cigarettes. Everyone is different so you have to figure out what will give you the same reward as the cigarettes. A lot of porn addicts tend to feel lonely and anxious so they masturbate to get relief. You might be able to substitute smoking for masturbating which may be less harmful than cigarettes but still not ideal. It will give you relief from the anxiety but you open the door to a new addiction. Ideally you want a new healthy behavior or at least a neutral one. You could go for a walk, have a snack, do some pushups, play video games, go for a drive. It really depends on you and what can relieve that trigger. You have to experiment and try different things to see what works best for you. Note that this explains why a lot of people who quit smoking get fat. They start using food to relieve their anxiety so make sure to choose your replacement behavior wisely.