Both. Nicotine dependence is a recognised diagnosis in the World Health Organization's classification of diseases. The cigarette after lunch, with chai, at the same corner every evening, is also a habit in the strict psychological sense: an action your surroundings set off before you have decided anything. Treat smoking as only one of these and the other is what catches you.
What "addiction" means here
The WHO's ICD-11 lists nicotine dependence under code 6C4A.2 (World Health Organization, ICD-11). The definition is worth reading closely, because it isn't quite what most people expect.
The core of it is "a strong internal drive to use nicotine", which shows up in three ways: trouble controlling how much you use, smoking taking priority over other things, and carrying on despite harm. Craving often comes with it. The physical features people tend to think of first, tolerance and withdrawal, are listed as features that "may also be present". They are not required for the diagnosis.
That matters for the question in the title. By the WHO's own wording, dependence is mostly about control and priority, which is to say about behaviour. The physical side is real, and withdrawal has its own post, but it isn't the whole of what the word means.
What "habit" means here
In psychology, a habit is not simply something you do often. It is a link stored in memory between a situation and a response, built because that response was rewarded in that situation many times over.
Wood and colleagues pulled together the evidence from social psychology, health psychology, neuroscience and animal learning in a 2022 review (Wood, Mazar and Neal, Perspectives on Psychological Science, 2022). Their central point is that once a habit forms, the situation activates the response directly, whatever your goals are. A habit doesn't check whether you have decided to quit.
If you have tried to stop, you probably know this from the inside. You have decided, properly decided, and there is still a cigarette in your hand after dinner. Your goal changed. The link between dinner and the cigarette did not.
Why each half-answer lets you down
Treat smoking as only a habit and you underestimate the first few days. "It's just a habit, drop it" is a common view, and it leaves people blaming themselves when the craving and irritability arrive.
Treat it as only an addiction and you expect the problem to be over once withdrawal eases. Then the after-dinner pull turns up anyway, weeks later, because nothing has happened yet to the link between dinner and smoking. That is the pattern behind cravings that show up months after quitting.
The habit half also needs something the other half doesn't: a plan. It won't fade on its own while every meal still ends the old way.
Your habit has an address
The useful thing about the habit half is that it is specific. It lives in particular places, times and company: the tapri near the office, the walk after lunch, the cigarette after a meal, the first drink of the night.
Wood's review describes two features of habit memory: it fires quickly, and it resists change. Together they explain why a general decision to quit tends to lose to one specific Tuesday after lunch. The decision is slow and general. The habit is fast and local.
That also tells you where to put the work. Not on smoking in general, but on the five or six situations where your hand moves before you do.
How long does breaking it take?
You will see "21 days" everywhere. It doesn't come from smoking research, and the best evidence on habits points somewhere else.
That evidence is on forming new health habits rather than breaking old ones. A 2024 systematic review found that, in the four studies that timed it, the median time to form a habit was 59 to 66 days, with individuals ranging from 4 to 335 days (Singh, Murphy, Maher and Smith, Healthcare, 2024). The habits studied were things like exercise, diet and flossing, and more than half of the studies carried a high risk of bias, so treat the figure as a rough guide.
Two things transfer anyway. For the typical person it is closer to two months than three weeks. And the range is enormous, so if day 21 arrives and the after-dinner pull is still there, nothing has gone wrong.
What actually weakens the habit
The habit weakens through repetition: being in the cue situation and having it end differently, many times. Two things make that more likely.
The first is deciding the response in advance, so the moment doesn't have to produce a decision. An if-then plan names the exact situation: if I finish lunch and want one, then I walk to the gate and back. We have a longer list of responses sorted by type of moment.
The second is not fighting the thought. Smokers instructed to push thoughts of smoking out of their minds went on to smoke more over the following days (Erskine, Georgiou and Kvavilashvili, Psychological Science, 2010). The urge is allowed to arrive. Each time it arrives and nothing follows, the link loses a little strength. The difference between an urge and the story you tell about it is useful here.
Where Nicoxit comes in
Nicoxit works on both halves, habit first. You keep smoking for the first six days, because you can only map a habit you are still performing. Day 3 has you log what sets each cigarette off. By Day 6 you are writing if-then plans for your own most common triggers, and the Anchor statement is that plan in one written sentence. Day 7 is the quit.
After that, "Log an urge" is for the moments when the old cue still fires, and Your Wins shows which trigger turns up most, so you aren't guessing where to put the effort.
31 modules over seven days, about forty minutes a day, then it's done. Cigarettes, vapes, hookah and IQOS.
Not medical advice.
References
- World Health Organization. (2025). 6C4A.2 Nicotine dependence. In ICD-11 for Mortality and Morbidity Statistics (2025-01 release). https://icd.who.int/browse/2025-01/mms/en#1699574100
- Wood, W., Mazar, A., & Neal, D. T. (2022). Habits and goals in human behavior: Separate but interacting systems. Perspectives on Psychological Science, 17(2), 590–605. https://doi.org/10.1177/1745691621994226
- Singh, B., Murphy, A., Maher, C., & Smith, A. E. (2024). Time to form a habit: A systematic review and meta-analysis of health behaviour habit formation and its determinants. Healthcare, 12(23), 2488. https://doi.org/10.3390/healthcare12232488
- Erskine, J. A. K., Georgiou, G. J., & Kvavilashvili, L. (2010). I suppress, therefore I smoke: Effects of thought suppression on smoking behavior. Psychological Science, 21(9), 1225–1230. https://doi.org/10.1177/0956797610378687
Frequently asked questions
Is smoking a habit or an addiction?
Both. Nicotine dependence is a recognised diagnosis in the WHO's ICD-11, and smoking in the same places and moments every day also builds a habit: a learned link between a situation and lighting up.
Is nicotine addiction physical or psychological?
By the WHO definition, the core features are behavioural: difficulty controlling use, smoking taking priority, and continuing despite harm. Physical features such as tolerance and withdrawal may also be present, but they are not required for the diagnosis.
How long does it take to break a smoking habit?
There is no smoking-specific figure. A 2024 review of new health habits found a median of 59 to 66 days to form one, with a range from 4 to 335 days, so expect something closer to two months than three weeks.
Is 21 days enough to quit smoking?
The 21-day figure doesn't come from smoking research. If you still feel a pull at particular moments after three weeks, that is within the normal range and not a sign the quit is failing.
Why do I still want a cigarette after meals even though I've decided to quit?
Habits are triggered by situations and run independently of your goals. Deciding to quit changes the goal but not the link between the meal and the cigarette, which weakens only as meals keep ending without one.
