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Quit guides / What quitting gives back

Quitting smoking day by day: what to expect in your first week

The first week is the hardest part of quitting smoking — and the most important to get through, because it is when withdrawal is strongest and when your body has already begun repairing itself.12

Here is a realistic, day-by-day picture of week one.

Last reviewed July 6, 2026

Your first week, day by day

  1. Day 1

    The clock starts — and so does repair

    Cravings and restlessness begin within hours. Meanwhile your body is already responding: within 12 hours the carbon monoxide in your blood drops back to normal.2 A strong first day is a strong start.

    cravingsrestlessness
  2. Day 2

    Nicotine is leaving your system

    Irritability, anxiety and appetite tend to climb as nicotine clears. Cravings come frequently, but each one passes in about 15 minutes.3

    irritabilityanxietyfrequent cravings
  3. Day 3

    Usually the hardest day

    For many people, day three is the peak — symptoms are at their most intense once nicotine has fully cleared. Knowing this in advance is your biggest advantage: it means the worst is happening on schedule, and it eases from here.1

    peak cravingslow moodtrouble concentrating
  4. Days 4–5

    Over the hump

    The physical peak begins to pass for most people. Cravings still show up, but they tend to space out and feel less overwhelming than day three.

    easing cravings
  5. Days 6–7

    The end of the toughest week

    You have cleared the most intense stretch — a genuine milestone, since the first week is when symptoms are strongest.1 Your circulation and lung function are already starting the improvements that continue over the next few weeks to months.2

    milestone reached

What you might feel this week

These are normal, temporary withdrawal symptoms — not signs that quitting isn't working:1

  • Strong cravings, most often in your usual smoking moments
  • Irritability, restlessness and anxiety
  • Low mood or feeling flat
  • Difficulty concentrating
  • Increased appetite
  • Disturbed sleep

Common questions

What is the hardest day of quitting smoking?

For most people it is around day three, when nicotine has fully cleared and withdrawal symptoms peak. They ease steadily after that.1

When do cravings stop after quitting?

Cravings are strongest in the first week, then improve noticeably after the first two to three weeks as your body adjusts.1

Will I gain weight in the first week?

Your appetite often increases because nicotine suppresses hunger. That is a normal part of withdrawal; planning healthy snacks helps you manage it.1

Get through week one, one day at a time

Day One shows exactly which day you're on and how close you are to the other side of the peak. Free on iPhone.

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Keep reading

Nicotine withdrawal timeline: what to expect, hour by hourHow to get through a nicotine cravingBenefits of quitting smoking: the timeline, 20 minutes to 15 yearsHow long does nicotine withdrawal last?

Sources

  1. NHS — Managing nicotine withdrawal symptoms
  2. CDC — Benefits of Quitting Smoking
  3. NHS inform — Cravings when you stop smoking

This guide is educational and is not medical advice. Timelines vary from person to person. If you are quitting heavy alcohol use, or have a medical condition, talk to a doctor before you stop — some withdrawals can be dangerous. In the US you can reach the free, confidential SAMHSA National Helpline at 1-800-662-4357, or call or text 988.