How long do nicotine withdrawal symptoms last?

Physical symptoms peak at 48–72 hours and mostly settle within two weeks. Occasional situational cravings can continue for a few months but are brief.

What is the hardest day of quitting smoking?

Day three for most people. Nicotine has fully cleared, sleep is disrupted and irritability peaks — then it improves noticeably from day four onward.

Does nicotine replacement therapy make withdrawal easier?

Yes. Combining a patch with a fast-acting form such as gum or lozenges reduces withdrawal severity and roughly doubles the chance of staying quit.

Nicotine Withdrawal Timeline: What Happens Hour by Hour

Updated 26 August 2026 · 7 min read

Withdrawal is uncomfortable, predictable and temporary. Knowing what is coming — and when it ends — is one of the strongest predictors of getting through it.

Hours 4–24: the first restlessness

Nicotine leaves the bloodstream within a few hours. You will feel edgy, distracted and hungry, and cravings arrive in waves of three to five minutes.

The single most useful fact about a craving: it peaks and passes whether or not you smoke. Ride out three minutes and the wave has broken.

Days 2–3: the peak

This is the hardest stretch. Irritability, poor concentration, headaches, tight chest and broken sleep are normal, and carbon monoxide has cleared so you may cough more as your lungs clear out.

Nothing goes wrong on day three — it just feels that way. Plan a light week, avoid alcohol, and keep nicotine replacement on hand.

Irritability and short temper
Trouble sleeping and vivid dreams
Increased appetite and sugar cravings
Coughing as cilia in the lungs recover

Week 1–2: the fog lifts

Physical withdrawal fades quickly after day four. Taste and smell sharpen, breathing improves, and cravings become shorter and further apart.

What is left is habit — the cigarette with coffee, on the drive home, after dinner. This is where trigger mapping does the heavy lifting.

Weeks 3–12: rebuilding the routine

By week three most people feel physically normal. Relapse at this stage is almost always situational: alcohol, stress, an argument, a friend who smokes.

Decide in advance what you will do instead in each of those three or four situations. A written plan beats willpower every time.

What actually helps

Nicotine replacement therapy — patches for background cravings plus gum or lozenges for spikes.
Prescription options such as varenicline, which are cheap on the PBS and roughly triple quit rates.
Delay, drink water, distract — the three-minute rule for any single craving.
Support: Quitline on 13 7848, a community, or a coach that answers at 2am.

Common questions

How long do nicotine withdrawal symptoms last?: Physical symptoms peak at 48–72 hours and mostly settle within two weeks. Occasional situational cravings can continue for a few months but are brief.
What is the hardest day of quitting smoking?: Day three for most people. Nicotine has fully cleared, sleep is disrupted and irritability peaks — then it improves noticeably from day four onward.
Does nicotine replacement therapy make withdrawal easier?: Yes. Combining a patch with a fast-acting form such as gum or lozenges reduces withdrawal severity and roughly doubles the chance of staying quit.