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Why Cigars Smell Like Ammonia: The Sick Period Explained (2026)
Raching NANOO™ technology actively removes ammonia — accelerating the sick period. Free shipping →
Cigar Chemistry · Storage Science · March 2026
Why Cigars Smell Like Ammonia:
The Sick Period Explained
You open your humidor to a sharp, chemical smell. Your new cigars smell like cleaning products. Nothing is wrong — but your cigars are not ready to smoke. Here is what is happening at the biochemical level, how long it lasts, and how to speed it up.
Definition
The Cigar Sick Period
The sick period (also called the rest period or recovery period) is the phase immediately following cigar delivery during which tobacco off-gases accumulated ammonia and other fermentation byproducts. These compounds — primarily ammonia (NH₃), volatile organic acids, and residual fermentation gases — accumulate during rolling, boxing, and shipping. In sealed or low-ventilation environments (like a box on a cargo ship), off-gassing cannot escape and concentrations build. Once placed in a ventilated humidor, the compounds dissipate over 2–4 weeks. Smoking during this period produces a sharp, harsh, chemical flavor that masks the cigar's intended profile entirely.
The Biochemistry: Where the Ammonia Comes From
Tobacco undergoes multiple fermentation stages during manufacturing. During fermentation, proteins in the leaf break down into amino acids and then into ammonia — a natural and necessary step in developing complex cigar flavor. The problem is that residual ammonia is still present in the finished cigar. During transportation in sealed containers, this ammonia concentrates in the microenvironment around the tobacco.
✓ The Chemistry — Protein Degradation to Ammonia
During high-temperature fermentation, tobacco proteins undergo proteolysis — they break into amino acids, which further break into volatile nitrogen compounds, primarily ammonia (NH₃). This process is essential to flavor development and harshness reduction. But residual ammonia in a finished cigar that has been in transit and sealed storage requires active ventilation to fully dissipate. Habanos S.A. explicitly references allowing "off-gassing of residual fermentation byproducts" as part of their aging recommendation — which is why their standard specifies "adequate ventilation."
Source: Habanos S.A., "Ageing Finished Cigars"; Cigars International fermentation chemistry documentation.Cuban cigars, which undergo more intensive and longer fermentation cycles than most New World cigars, typically have a more pronounced sick period — particularly Cohiba, Montecristo, and Partagas lines. New World cigars from Nicaragua and the Dominican Republic generally have shorter sick periods due to different fermentation protocols.
The Recovery Timeline
Day 0–3 · Peak Off-Gassing
Strongest ammonia smell — do not smoke
Ammonia concentration is at its peak immediately after opening boxes or placing new cigars in the humidor. The smell will be sharp and noticeable when opening the humidor door. This is normal. Do not smoke.
Day 3–10 · Active Dissipation
Ammonia reducing — still detectable
With adequate ventilation, ammonia levels drop significantly in the first week. The smell becomes less sharp. Smoking is still not recommended — the flavor profile remains distorted by residual compounds.
Day 10–28 · Final Recovery
Ammonia dissipating — flavors emerging
Between 10 and 28 days, ammonia levels continue to drop toward undetectable. The cigar begins expressing its intended flavor profile. Test by resting the unlit cigar under your nose — no chemical sharpness should remain.
Day 28+ · Fully Recovered
Smoke now — full flavor profile intact
After 4 weeks in a properly ventilated humidor at 65–70% RH, the sick period is complete. The cigar now expresses its full intended flavor, aroma, and complexity. Long-term aging can continue to develop additional complexity beyond this point.
Factors That Affect Sick Period Length
| Factor | Effect on Sick Period |
|---|---|
| Cuban cigars (Habanos) | Longer — 3–6 weeks typical. Intense fermentation cycle produces more ammonia. |
| New World cigars (Nicaragua, DR) | Shorter — 1–3 weeks typical. Different fermentation protocols. |
| Sealed box / travel humidor | Extends sick period significantly — ammonia cannot escape low-ventilation environment. |
| Conventional passive humidor | Standard 2–4 week recovery with regular lid opening providing natural ventilation. |
| Raching electric humidor (NANOO™) | Accelerated — active photocatalytic oxidation breaks down ammonia compounds actively. |
Sources: Cigar Aficionado; Holt's Cigar Company; Cigars International; Habanos S.A.; Raching NANOO™ product specification.
Technology Spotlight
Raching NANOO™ Ammonia Removal
Raching MON series electric humidors use NANOO™ technology — a photocatalytic oxidation system built into the humidity control unit. It actively breaks down ammonia (NH₃) and volatile organic compounds (VOCs) within the storage environment rather than simply allowing them to dissipate passively. The result is a measurably faster sick period recovery and a cleaner ambient environment for long-term aging. This is one of two key differentiators between Raching and conventional humidors — the other being ±1% RH precision. See the full ammonia removal technology guide.
Shop Raching MON Series →
How to Speed Up the Sick Period Without Special Equipment
If you have a conventional passive humidor, the recovery time is largely determined by ventilation. Here are the most effective strategies:
Best Practice — Accelerating Recovery
Open the humidor briefly (2–3 minutes) twice per day during the first two weeks after loading new cigars. This exchanges the ammonia-saturated interior air with fresh air, accelerating dissipation. Do not leave the lid open for extended periods — this disrupts humidity stability. Some collectors also keep boxes slightly open rather than sealed when first placing them in the humidor, allowing faster off-gassing from the cigars themselves.
Source: Holt's Cigar Company; Cigar Advisor sick period recovery guidance.NANOO™ Eliminates the Wait
Raching electric humidors with NANOO™ technology actively remove ammonia and VOCs — cutting the sick period and maintaining a cleaner aging environment. Free shipping. No sales tax.
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Frequently Asked Questions
Why do my cigars smell like ammonia?
Cigars smell like ammonia due to off-gassing of residual fermentation byproducts — primarily ammonia compounds — that accumulate during manufacturing and transportation. This is the "sick period." It is completely normal and dissipates over 2–4 weeks in a properly ventilated humidor.
How long does the cigar sick period last?
Typically 2–4 weeks in a conventional humidor with regular ventilation. Cuban cigars often take 3–6 weeks due to more intensive fermentation. Raching electric humidors with NANOO™ technology accelerate this significantly through active ammonia removal.
Can you smoke a cigar during the sick period?
Yes, but the experience is significantly degraded. Residual ammonia tastes sharp, acrid, and chemical. The cigar will not express its intended flavor profile. Most experienced collectors wait until no chemical sharpness remains when resting the unlit cigar under the nose.
Does NANOO technology eliminate the cigar sick period?
Raching's NANOO™ photocatalytic oxidation system actively breaks down ammonia and VOCs — significantly accelerating the sick period rather than waiting for passive dissipation. It is one of the key differentiators of the Raching MON series. See the full ammonia removal guide.
What is the cigar sick period?
The sick period is the recovery phase after delivery during which cigars off-gas accumulated ammonia and fermentation byproducts. It ends when these compounds fully dissipate, leaving the cigar at its intended flavor profile. Cuban cigars have the most pronounced sick period due to intensive fermentation.
Sources & References
- Habanos S.A. — "Ageing Finished Cigars" (ventilation requirement; fermentation off-gassing reference)
- Cigars International — Fermentation chemistry and sick period documentation
- Cigar Aficionado — Sick period and cigar rest period recommendations
- Holt's Cigar Company — Sick period acceleration and ventilation guidance
- Raching Global — NANOO™ photocatalytic oxidation technology specification (MON series)
Published March 12, 2026 · Daniel Andersson · Luxury Wine AppliancesSlug: /blogs/news/why-cigars-smell-like-ammonia-sick-period