Clean break or step by step. YUTHI shows you every day what you've already achieved — and a slip erases nothing.
Three things the app calculates for you — the sources are listed at the bottom of the page.
Enter what you smoke and what a pack costs. The app adds up the money and the time of life. On average, one cigarette costs about 11 minutes of life.5
In a large US study, people who quit before 35 gained back about 10 years of life, those between 45 and 54 about 6.6 Cigarettes, roll-ups, heated tobacco, e-cigarettes and cigars each get their own price.
Many counters jump back to zero after a single cigarette. YUTHI keeps counting: a slip is noted and subtracted, but it erases nothing.
Example: quit 4 weeks ago, 15 a day
What counts is the direction. After a slip, you carry on from where you are.
Nine milestones from the US health authority CDC — from your pulse after a few minutes to a heart that, after 15 years, is almost as healthy as that of someone who never smoked.4
Green: reached after 4 weeks. The times are averages from observational studies, not a guarantee — but the direction is the same for everyone.
Both ways are possible. If you choose steps, you get a ladder built from your own starting point and stay on a step as long as you like. In a study of 697 smokers, 22 % were smoke-free after 6 months with a clean break and 15.5 % with the gradual approach — the app tells you honestly and lets you choose.7
The steps are 100, 70, 50, 30 and 10 % of your starting value. If you smoke 20 or more a day, you get a gentler first step at 85 %, so the first step is smaller.
One tap on “Craving” notes the moment with its time and shows you a four-minute exercise.
Under “Help” you'll find free support lines for your country, in Switzerland for example the quitline 0848 000 181. Telephone counselling increases the chance of staying smoke-free.11
When you quit, you use slightly less energy: in a measurement chamber, daily expenditure rose by 215 kcal with 24 cigarettes.8 From the day after you quit, the app subtracts this from your calorie goal — and shows how much walking makes up for it.
That's about 6200 steps. On a day with a slip, the deduction doesn't apply. On average, people gain 4 to 5 kg in the first year after quitting — that's not failure.10
After quitting, the body breaks caffeine down more slowly: in people who had smoked 20 or more a day, breakdown fell by 36 %.9 The app factors this into your caffeine curve.
So better earlier in the day. Something similar applies to medications — tell your doctor that you're quitting.
The app already calculates these connections today. A connection is not a cause — but it shows you where to look.
From the day after you quit, the app subtracts about 9 kcal per cigarette you used to smoke a day from your calorie goal — at most 215 kcal.
The movement balance on the Sport page shows how many minutes of brisk walking make up for the lower expenditure.
If you smoked 20 or more a day, the app factors a longer caffeine effect into your caffeine curve after you quit.
If you've logged medications, the app points out when you quit that some are broken down more slowly — the decision stays with your doctor.
In a US study of about 200,000 adults, smokers' risk of death was about three times that of people who had never smoked. Those who quit before 40 cut the extra risk by about 90 %. Even those who quit at 45 to 54 gained about 6 years of life on average compared with continuing to smoke.1
Counselling and medication can more than double the chance of quitting successfully.2
After quitting, most people gain some weight: on average about 1.1 kg in the first month and 4.7 kg after a year, most of it in the first three months. That is not failure. 16 % even lost weight.3
The WHO names counselling and medication as what raises the chance of success the most. In the app you find counselling services right in the area.2
Nicotine lengthens the time to fall asleep, fragments sleep and suppresses REM sleep. Withdrawal also disturbs the nights.4
A new article every Friday.
Biohacking · Quitting smokingQuitting smoking: what happens in your body after the last cigarette — the timeline with sourcesWithin minutes your heart rate drops, after a day nicotine is out of your blood, and after years the additional risk for your heart and lungs is cut in half. We show you what happens after quitting and when, where the health authorities disagree, and why it's still worth it even at 50.Read more
Mindset · Quitting smokingQuitting smoking: which methods really help, according to studiesNicotine patches, varenicline, e-cigarettes, a quit-smoking hotline, or just going cold turkey? We read the major Cochrane reviews and show you what helps when quitting, how much it helps, what it costs, and where to get free support in Switzerland, Germany, and Austria.Read more
Mindset · Quitting smokingRelapse after quitting smoking: what is behind cravings and weight gain — and what helpsMost relapses happen in the first week, a craving lasts only a few minutes, and the extra weight after quitting is no reason to keep smoking. What lies behind relapse, cravings and weight gain — and which forms of help studies show actually work.Read moreEvery statement comes with its source; the figures are taken from the linked studies and opinions (checked on 1 November 2026). This is context from the research, not a diagnosis and no substitute for medical advice.
Get YUTHI from the App Store — iPhone first, from November 2026.
