Most pages answering this question are American or British. The biology is the same wherever you live, but the support available is not — so this page uses Australian sources and points to Australian services.
The short answer
Nicotine withdrawal symptoms usually start within a few hours of your last cigarette or vape, are strongest in the first week, and typically peak around days 2 to 3. For many people the worst has passed by 2 to 4 weeks. Some symptoms can persist for 8 to 12 weeks, and brain chemistry takes at least 3 months to settle.
Why the ranges are so wide
You will see confident, precise timelines elsewhere — “day 3 is the worst, day 10 you are free”. Australian sources do not agree that tightly, and it is more useful to know that than to be given false precision. Quit puts the peak at 2 to 3 days; other guidance describes a peak anywhere from 2 days to a week, and a tail lasting weeks to months.
How much you smoked, for how long, how soon after waking you had your first, whether you are using nicotine replacement, and what else is happening in your life all move these numbers. If your experience does not match a chart, the chart is wrong, not you.
Roughly what happens, and when
| When | What people commonly report |
|---|---|
| First few hours | Cravings begin. Often starts 2–3 hours after the last cigarette. |
| Days 1–3 | Usually the hardest stretch. Cravings, irritability and anger, restlessness, trouble sleeping, difficulty concentrating, increased appetite. |
| First week | Symptoms at their strongest overall. Cravings are frequent but individually short — most pass within a few minutes. |
| Weeks 2–4 | For many people, symptoms fade noticeably. Cravings become less frequent, though they can still be triggered by situations and routines. |
| Weeks 4–12 | Some symptoms — low mood, appetite changes, occasional strong cravings — can persist. This is normal and does not mean it is not working. |
| 3 months+ | Brain chemistry has largely returned to normal. Situational cravings can still appear long after physical withdrawal ends. |
Common symptoms
- Strong cravings
- Irritability, anger, frustration
- Trouble sleeping
- Increased hunger
- Feeling upset, low or anxious
- Difficulty concentrating
- Restlessness
One thing that helps immediately
Individual cravings are short. They build, peak and pass, usually within a few minutes. Knowing that a craving has a ceiling and an end — rather than escalating forever — is one of the more useful things to hold on to in the first week.
When to talk to someone
Talk to your pharmacist or GP if symptoms are severe, if your mood drops significantly, or if you take medicines that may need adjusting — stopping smoking changes how some medicines are processed by the body. If you are struggling with your mental health, contact your GP, or Lifeline on 13 11 14.
Quitline is free. Call 13 7848 to speak with a trained counsellor. Repeated brief support is associated with better outcomes than going it alone, and it costs nothing.
Related: what to say to a pharmacist about quitting.
Sources
- Quit — What is nicotine withdrawal?
- Quit — The first few days
- iCanQuit — What to expect when you quit
- Department of Health — Nicotine is addictive
- healthdirect — Quitting smoking and vaping
Last checked: 3 September 2026. This page has not been reviewed by a registered health professional — see our editorial policy.