FREQUENTLY ASKED QUESTIONS
See also: the recovery timeline — what heals weeks, months, and years after you quit.
GETTING STARTED
What is 336?
336 is a 14-day clinical detox sprint for quitting nicotine cold turkey. The name comes from the total hours in 14 days: 336. The app and website track every single hour of withdrawal with clinical data about what's happening in your body, audio briefings, and tactical advice. The website (quit336.com) provides all clinical information free. The app adds real-time tracking, push notification briefings, and a craving SOS tool.
Is 336 for vaping, smoking, or both?
Both. The core nicotine withdrawal timeline is identical whether you vape or smoke — nicotine is nicotine. However, 336 provides separate content tracks because the delivery mechanisms, trigger patterns, and recovery details differ. Vapers get content about nicotine salt concentrations, propylene glycol clearance, and device-culture triggers. Smokers get content about carbon monoxide clearance, tar removal, cilia regeneration, and ritual disruption.
Why cold turkey? Why not patches, gum, or medication?
Cold turkey has the highest long-term success rate of any cessation method — approximately 65-75% of successful long-term quitters used cold turkey. Nicotine replacement therapy (patches, gum, lozenges) keeps your brain's surplus receptors partially activated, preventing the complete downregulation that cold turkey achieves. When you eventually stop the NRT, you face a second withdrawal. Prescription medications like varenicline (Chantix) work differently and may be appropriate for some people, but cold turkey remains the most effective approach for the majority of quitters.
Is quitting cold turkey dangerous?
No — nicotine withdrawal is uncomfortable but not medically dangerous for healthy adults. The symptoms (cravings, irritability, difficulty concentrating, cessation anger, sleep disruption) peak around days 2-3 and improve steadily after that. The pharmacological withdrawal ends completely at hour 72. If you have cardiovascular disease, severe psychiatric conditions, COPD, or are pregnant, consult your doctor before quitting — not because cold turkey is dangerous, but because withdrawal stress may need monitoring.
How should I prepare for quitting?
Dispose of all nicotine products and devices. Clean your environment (remove ashtrays, wash jackets, air out rooms). Stock oral substitutes (cinnamon gum, strong mints, raw carrots). Modify your trigger routines in advance (plan different morning, break, and evening activities). Tell one trusted person you're quitting. Set your quit time. Then open the 336 app or website and start your sprint.
THE TIMELINE
What happens in the first 24 hours?
Your body begins clearing nicotine immediately through liver metabolism. Blood nicotine drops by 50% every 2 hours (half-life). By hour 24, less than 0.02% remains. For smokers, carbon monoxide releases from hemoglobin within hours — blood oxygen approaches non-smoker levels by hour 24. Heart rate and blood pressure begin normalizing. Cravings start mild and escalate throughout the day, reaching significant intensity by evening. The first 24 hours are manageable but set the stage for the harder days 2-3.
When is the hardest part?
Hours 36-48 are the clinical peak — the nadir of nicotine withdrawal. Nicotine levels approach zero, receptor desaturation is at its maximum, and the cumulative psychological weight of 2 days without your substance is heavy. Cessation anger (disproportionate rage) is common at this stage. After hour 48-54, withdrawal intensity begins declining. After hour 72, the pharmacological withdrawal ends entirely. Many people describe hours 36-48 as the "if I can survive this, I can survive anything" window.
When do cravings stop?
Cravings change character over the 14 days. Days 1-3: frequent (every 30-60 minutes), intense (3-5 minutes each), chemically driven. Days 4-7: less frequent (3-5 per day), shorter (60-90 seconds), increasingly habitual rather than chemical. Days 8-14: rare (0-2 per day), brief (30-60 seconds), more like passing thoughts than urgent needs. Some situational triggers may surface for weeks to months, but they lack the pharmacological urgency of early withdrawal. At day 14, acute cravings are essentially over.
What happens after 14 days?
After 336 hours, your brain's nAChR receptor density has returned to non-user baseline. The physiological addiction is broken. Your body continues healing: lung function improves significantly over months 1-9, cardiovascular risk drops by half at 1 year, and cancer risk declines over 5-15 years. The behavioral maintenance (managing triggers, sustaining identity) continues but without the neurological urgency of the first 14 days. Key milestones: day 30, day 90 (relapse risk drops below 5%), and day 365.
SYMPTOMS
Why am I coughing more after quitting?
Your lungs' cilia — tiny hair-like cleaning structures — were paralyzed and damaged by smoke or aerosol. They're regenerating and actively sweeping out accumulated debris: tar, particulate matter, and mucus that built up during months or years of use. Increased coughing with mucus production means your lungs are cleaning house. This is healing, not a new problem. It typically peaks around days 3-7 and resolves by day 14 for most people, though heavy long-term smokers may cough for several weeks as their lungs clear a larger backlog.
Why can't I sleep?
Nicotine disrupts sleep architecture in two ways: it suppresses REM sleep and it affects your circadian system through interaction with melatonin pathways. When you quit, both systems recalibrate. REM rebound (days 3-5) produces vivid, sometimes disturbing dreams as your brain catches up on the REM sleep it was denied. Circadian disruption causes difficulty falling asleep and nighttime waking. Sleep quality typically improves dramatically around days 7-10 as your brain's sleep regulation stabilizes.
Is weight gain inevitable?
No, weight gain is not inevitable, though some gain is common — averaging 2-4 kg (4-9 lbs) in the first month. This happens because nicotine artificially suppressed appetite (via leptin signaling) and boosted metabolism (by 7-15%). These effects reverse when you quit. The gain is manageable and temporary: metabolism stabilizes within 2-3 months, and appetite-regulating hormones normalize. The health benefit of quitting vastly outweighs any temporary metabolic shift. Protein-rich snacks, adequate hydration, and regular exercise all help.
Why do I have brain fog?
Nicotine artificially enhanced cognitive function by stimulating acetylcholine receptors in your prefrontal cortex. Without it, your brain must rebuild its own acetylcholine production and establish normal neurotransmitter balance. This transition period produces the "brain fog" — difficulty concentrating, slower processing, scattered attention. It peaks days 1-3 (when receptor desaturation is most acute) and typically clears significantly by day 7. Full cognitive function returns by day 14 as your cholinergic system achieves independence.
What is cessation anger?
Cessation anger is a documented clinical phenomenon: sudden, disproportionate, sometimes irrational rage responses to minor stimuli during nicotine withdrawal. It's caused by acute disruption of your GABAergic and serotonergic neurotransmitter systems. It peaks around days 2-3 and typically resolves by day 7. It's not a character flaw — it's pharmacology. Management: remove yourself from situations where anger could cause damage, use isometric exercises (push against a doorframe for 15 seconds), and practice 4-7-8 breathing (inhale 4, hold 7, exhale 8).
THE APP
Is 336 free?
Free to start. The app includes full access to the 336-hour clinical timeline, real-time withdrawal tracking, and the SOS craving breathing exercise. Optional in-app purchases: unlimited quit retries ($4.99) for people who reset and want to try again, and audio briefing guides ($6.99, available after hour 72) for professionally narrated clinical briefings at key hours. The website (quit336.com) provides all clinical information completely free with no paywall.
What platforms is 336 available on?
336 is available on iOS (App Store) and Android (Google Play). The website at quit336.com provides the full 336-hour clinical guide for free and works on any device with a browser.
Do I need the app or can I just use the website?
The website has all the clinical information free — 672 hour pages, 28 day pages, 24 symptom timelines, audio briefings with transcripts. The app adds four things: (1) a real-time quit clock that tracks your exact hour, (2) push notification briefings delivered during your waking hours so guidance finds you at the right moment, (3) an SOS breathing exercise for craving emergencies, and (4) audio briefings playable from your lock screen. The website informs; the app accompanies.
What data does 336 collect?
Minimal, anonymous data: quit timestamp, delivery system (vaping/smoking), reset history (for understanding common failure points), and anonymous usage events (which briefings are played, when SOS is used). No personal information, no tracking, no selling data. All personal data stays on your device. See the privacy policy at quit336.com/privacy for full details.
CRAVINGS & WITHDRAWAL TIMELINE
How long do nicotine cravings last?
Individual cravings are short — typically 3 to 5 minutes — even when they feel intense, and they come in waves. Physically, nicotine clears your body within about 72 hours, and physical withdrawal peaks in the first 3 days then fades. Psychological, cue-based cravings (after meals, while driving, with coffee or alcohol) can surface for weeks to a few months, but they get shorter, weaker, and less frequent over time.
When do cravings peak?
The first 72 hours are the hardest, when blood nicotine drops to zero. In the first day or two, urges tend to spike roughly every 60 to 90 minutes, then space out. By the end of the first two weeks most people report far fewer and milder cravings.
Is it normal to have no cravings at all?
Yes. Some people experience surprisingly few cravings, especially if their nicotine intake was lower or their daily routine changed. A light withdrawal doesn't mean it isn't working — it means you're getting through it. Stay alert to cue-based triggers, which can appear even when the physical withdrawal is mild.
Do cravings ever fully go away?
For most people, yes. Physical dependence resolves within days; the habit loop and cue associations fade over weeks to months. Occasional fleeting urges can appear long after quitting, but they pass quickly on their own and do not require nicotine to resolve.
COMMON CONCERNS
Why can't I sleep after quitting vaping?
Sleep disruption is one of the most common early withdrawal symptoms. Nicotine is a stimulant, and your brain is recalibrating without it. Insomnia, vivid dreams, and lighter sleep usually peak in the first week and improve within 2 to 4 weeks. A consistent bedtime, cutting caffeine after midday, and daytime exercise all help.
Is anxiety normal when quitting nicotine?
Yes. Many people feel more anxious or irritable in the first days to weeks. Nicotine temporarily masks stress, so its absence can feel like heightened anxiety until your brain chemistry rebalances — typically within 2 to 4 weeks. Slow, paced breathing (the in-app SOS exercise uses 4-7-8 breathing) calms the nervous system in the moment.
I have ADHD — will quitting nicotine be harder?
People with ADHD often use nicotine to self-medicate focus and may find the first weeks harder, with more brain fog and restlessness. This is real and temporary. Structure, exercise, and short focused work blocks help early on. 336 does not give medical advice — if you take or are considering ADHD treatment, that's a conversation for your doctor.
Will I gain weight after quitting?
Appetite often increases after quitting, because nicotine suppresses hunger and slightly raises metabolism. Any early change is usually modest and manageable with normal meals, water, and movement. 336 deliberately does not track weight or money saved — it keeps you focused on what's happening inside your body.
What about nicotine patches, gum, or cytisine?
Those are nicotine-replacement or cessation-aid approaches. 336 is built specifically for quitting cold turkey — no tapering, no substitutes — because the program's hour-by-hour clinical model is designed around full cessation. NRT and prescription aids are legitimate options for many people; if you want to use them, discuss them with a pharmacist or doctor.