Quit vaping: the trial nobody quotes
Vape withdrawal peaks on days 1–2 and is, on average, milder than cigarette withdrawal — but 41% of people still had symptoms at the end of day six. The finding almost nobody repeats: nicotine patches and gum have failed to beat control in every published vaping-cessation trial. Varenicline has not.
There is exactly one clinical trial that put daily vapers through verified abstinence and measured what happened. It ran 109 former smokers through seven days of normal vaping and then six days of biochemically confirmed abstinence. Almost nothing written about quitting vaping cites it, which is strange, because it answers most of the questions people actually ask.
This page is built around that trial and the eleven randomised trials of vaping cessation published since 2021. Some of what they found is reassuring. One finding is the opposite of what you have probably been told, and it matters more than the rest.
What the abstinence trial measured
| Outcome | Result over six days without vaping |
|---|---|
| DSM-5 withdrawal symptoms | All seven increased |
| Additional symptoms | Anhedonia, impulsivity, mood swings, reduced positive affect |
| Peak | Days 1–2, then a steady decline |
| Still symptomatic at day 6 | 41% of participants |
| Resting heart rate | 77.2 → 70.7 bpm |
| Weight | +0.7 kg across the week |
| Versus cigarette withdrawal | Somewhat milder |
| Completed the full week | Only about half, despite escalating cash incentives |
Pre–post clinical trial, 109 daily vapers who were former smokers, NCI-funded. The lead author discloses consulting fees from tobacco companies, so read the framing with that in mind — the measurements themselves are straightforward.
The finding that should change your plan
Across three randomised trials and 567 participants, nicotine replacement therapy has not once beaten control for quitting vaping. The largest — 508 people — returned an odds ratio of 1.30 with a confidence interval crossing 1. The other two were not close either.
This is the reverse of the smoking-cessation position, where NRT is a first-line treatment with decades of support. People quitting vapes are routinely handed patches on the assumption that the smoking evidence carries over. It has not been shown to.
What has worked in trials: varenicline (adjusted odds ratio 6.0 against placebo in 16–25 year olds, and 2.52 in another trial) and, surprisingly, a text-message programme — 38.7% versus 28.0% in 1,503 people, the most robust behavioural result in the literature. Cytisinicline did not reach significance.
Withdrawal at a glance
| Symptom | Starts | Peaks | Eases |
|---|---|---|---|
| Craving waves | 1–4 h | Days 1–2 | 2–4 weeks |
| Irritability & mood swings | Hours 6–12 | Days 1–2 | 2–3 weeks |
| Anhedonia (nothing feels good) | Day 1 | Days 2–4 | 2–6 weeks |
| Impulsivity | Day 1 | Days 1–3 | 2–3 weeks |
| Difficulty concentrating | Day 1 | Days 2–3 | 2–3 weeks |
| Sleep disturbance | Night 1 | Week 1 | 2–3 weeks |
| Cigarette cravings (if you used to smoke) | Days 1–2 | Week 1 | Variable |
Compare all 11 withdrawal timelines →
Your timeline after the last puff
Six days, measured
Acute withdrawal · Hours 0–144
No natural gap to fall back on Hours 0–12
Vaping has no unit. There is no finishing a cigarette, no removing a pouch — so there is no trough you are used to.
- Hour 0The one product that matched a cigarette
A pod device can peak in about four minutes at a cigarette-equivalent blood level — the only nicotine product outside smoking that does. If you used a nic-salt pod, your curve was a smoker's curve, and so is your withdrawal.
Solid evidence - Hour 2Half of the free nicotine is gone
About a two-hour half-life for nicotine, sixteen to twenty hours for cotinine. Device wattage and e-liquid strength changed how much went in; they change nothing about how fast it leaves.
Solid evidence - Hour 6Grazing withdrawal
Because you vaped in gaps rather than in sessions, you have no memory of what a nicotine-free hour feels like. Expect the first waves to feel unfamiliar rather than merely unpleasant.
Reasonable evidence - Hour 12The full symptom set arrives
All seven DSM-5 withdrawal symptoms rose in the trial, plus four the smoking literature does not emphasise: anhedonia, impulsivity, mood swings and reduced positive affect.
Solid evidence
Peak Days 1–2
The measured top of the curve — and the one place the news is good.
- Day 1Peak, and it is milder than a cigarette peak
Withdrawal followed the classic inverted U with its top at days 1–2, and the magnitude was somewhat less than in a comparable study of cigarette smokers. This is a rare instance where the honest answer is the encouraging one.
Solid evidence - Day 1Old cigarette cravings come back
If you switched from smoking to vaping, expect craving for cigarettes to rise alongside craving for the vape — measured, and unexpected by most people it happens to. Knowing it is coming is most of the defence.
Solid evidence - Day 2Heart rate begins to fall
Across the abstinence week, resting heart rate fell from 77.2 to 70.7 bpm. That is a real, measurable change in six days, and one of the few you can check yourself.
Solid evidence - Day 2Severity now does not predict success later
In the trial, how bad the first two days were did not predict whether someone made it to the end of the week. A brutal Tuesday is not a verdict.
Reasonable evidence
The slope Days 3–6
Downward, at about 0.07 units a day on the trial's scale.
- Day 3Nicotine and cotinine effectively cleared
Whatever you feel now is your nervous system re-regulating rather than a drug still circulating.
Solid evidence - Day 4Anhedonia is the one that lingers
Reduced positive affect and anhedonia were among the additions to the classic set. Ordinary things feeling flat is a withdrawal symptom, not evidence that quitting was a mistake.
Reasonable evidence - Day 641% are still symptomatic
Nearly half of people are not done at one week. Only about half of the trial's participants managed the full week of abstinence — with money on the line. Plan for a fortnight, not a weekend.
Solid evidence - Day 6Weight up slightly
About 0.7 kg across the abstinence week, consistent with the appetite change nicotine was suppressing.
Reasonable evidence
The part that is genuinely unknown
Beyond week one
What happens after Week 2 – Month 6
Past six days, there is no trial. What follows is nicotine pharmacology, stated as such.
- Week 2Cravings become cue-bound
They stop being a background state and start being triggered — the car, the balcony, the phone in the other hand. Nicotinic receptor density normalises over roughly this window.
Reasonable evidence - Week 3Sleep starts to settle
Sleep disturbance is among the last acute symptoms to go in every nicotine product measured.
Reasonable evidence - Month 2The device habit outlives the drug
Vaping has no natural stopping point, so the hand-to-mouth loop is reinforced far more times per day than smoking is. Expect the gesture to outlast the craving.
Indicative - Month 3+Nobody can tell you what your lungs are doing
The UK health authority's evidence review concluded there is insufficient evidence from spirometry, FeNO, oscillometry, bronchoscopy and imaging to say whether vaping affects lung function at any exposure length. There is no usable evidence on cough or phlegm after quitting vaping either. This page will not invent a lung-recovery milestone to fill the gap.
Indicative
Four things people get wrong
- “Vape withdrawal isn't real.” All seven DSM-5 symptoms increased under verified abstinence, alongside a measurable drop in heart rate and a measurable rise in weight. It is real and it has been counted.
- “Patches will get me off this.” Three trials, 567 people, no benefit over control. That is not proof they never help anyone; it is proof the assumption has been tested and has not held up.
- EVALI was not nicotine vaping. Of 2,022 hospitalised patients with substance data, 82% reported THC-containing products and only 14% reported nicotine alone. Vitamin E acetate was found in patients' lung fluid and not in the fluid of people without EVALI. The final count was 2,807 cases and 68 deaths, peaking in September 2019.
- The strength on the label may be fiction. A Scottish enforcement project found most single-use disposables had not been notified as required, many above the 20 mg/mL legal cap. If you are “tapering” through disposables, you may not be tapering at all.