Cigar Beetles: Signs, Causes, and How to Get Rid of Them

A cigar beetle is a small, reddish-brown beetle — about 2 to 3 millimeters long, roughly the size of a sesame seed — whose larvae tunnel through dried tobacco leaf and other dried goods. The species is Lasioderma serricorne, and University of Florida entomology researchers note it also infests dried fruit, cereal, cocoa, coffee beans, spices, nuts, and pet food — tobacco is one host among many, not a special target.

The full life cycle runs about 40 to 90 days depending on temperature, and a single female can lay 10 to 100 eggs. That's the reason an infestation that starts as one stray beetle in a box can turn into visible wrapper damage across an entire humidor within a couple of months if it's never spotted.

Cigar beetle, tobacco beetle, and cigarette beetle are the same insect. Most cigar sites use only one of the three names, which is part of why searches for "cigar beetle" and "cigarette beetle" turn up such different-looking results — one leans cigar-community forums, the other leans pest-control and agricultural-extension sites. They're describing the identical bug. In our own keyword research for this guide, searches for the generic "cigarette beetle" name outnumber "cigar beetle" more than 10 to 1 — which is exactly why a plain web search on the topic tends to surface pantry- and spice-cabinet pest-control advice with nothing about wrappers, humidors, or aging a box of cigars back to health.

The clearest sign of a cigar beetle infestation is a small, round pinhole in a cigar's wrapper — that's the exit hole a larva chews on its way out after feeding inside the leaf. A single hole on one stick can be a fluke; holes on multiple cigars, or a fine dust (frass) collecting at the bottom of your humidor, means an active infestation.

Watch for:

• Pinhole-sized holes in the wrapper, often with a faint ring of loose tobacco around the edge.
• Fine, sawdust-like powder (frass) in the tray or on the humidor floor — larval waste and chewed tobacco.
• A live beetle — small, oval, reddish-brown — crawling on a cigar or the humidor lining.
• A musty or unusually sweet smell distinct from normal aged-tobacco aroma, sometimes reported alongside a heavier infestation.
• Crumbling or hollow-feeling spots under the wrapper when you gently press a cigar.

One hole doesn't mean your whole collection is lost — check every cigar in the box individually rather than assuming the worst or throwing everything out.

Cigar beetles are not a danger to people — they don't bite, sting, or carry disease, and the University of Florida's entomology fact sheet on the species lists no human-health risk associated with it. The real damage is entirely to the tobacco: larvae tunnel through the leaf, hollow out the filler, and can turn an expensive cigar into an unsmokable one. Treat an infestation as a storage problem to fix quickly, not a health emergency.

Cigar beetles almost always arrive already in the cigar, not from the air or the wood. Eggs or larvae can be present in tobacco leaf at the farm or factory level and simply go unnoticed through rolling, aging, and shipping — most infestations trace back to one contaminated box rather than pests migrating into a sealed humidor from outside.

Two conditions make an existing infestation worse once cigars are inside:

• Heat. Beetle eggs and larvae become active above roughly 74°F, which is one of the reasons our humidity guide recommends keeping a humidor well below that line, not just watching relative humidity.
• Undisturbed storage. A humidor that's rarely opened or rotated gives an infestation weeks or months to spread from one box to the rest of the collection before anyone notices.

The standard fix is to freeze the affected cigars, which kills eggs, larvae, and adult beetles without damaging the tobacco if it's done correctly.

1. Isolate every affected cigar — and, to be safe, every cigar in the same section of the humidor — away from the rest of your collection immediately.
2. Bag each cigar in a sealed plastic bag to prevent moisture loss during freezing and to contain anything that crawls out.
3. Freeze for 72 hours. A deep freeze (not just a refrigerator) is what actually kills the insect at every life stage; our guide to how long cigars last covers this same 72-hour protocol for damaged sticks.
4. Thaw slowly at room temperature, still sealed, for 24 hours before opening the bag — opening a cold cigar to warm, humid air causes condensation that can crack the wrapper.
5. Inspect again. Discard any cigar with visible tunneling or a hollowed filler; wrapper-only holes on an otherwise sound cigar are typically still smokable once treated.
6. Deep-clean the humidor — wipe down the interior, replace the humidification media, and check every remaining cigar individually before returning anything to storage.

Skip the temptation to just throw the whole box away — freezing is the community-standard fix precisely because most infestations are containable once caught.

Prevention comes down to the same two levers that control an existing outbreak: keep temperature down and inspect new stock before it joins the rest of your collection.

• Keep your humidor below 74°F. Combined with the 65–70% relative humidity range from our cigar humidity guide, this keeps conditions outside the range beetle eggs need to activate.
• Quarantine new purchases for a week or two in a separate container before mixing them with your main collection, especially cigars from a retailer or auction site you haven't bought from before.
• Inspect on the way in, not just when something looks wrong — a quick wrapper check on new arrivals catches an infestation before it spreads.
• Rotate your stock. Opening and checking your humidor regularly means you catch pinholes and frass within days instead of months.
• Use a reliable hygrometer so you actually know your humidor's real conditions rather than assuming the dial is accurate.

A cigar beetle infestation is common, contained, and rarely fatal to a whole collection — the fix is isolate, freeze for 72 hours, thaw slowly, and inspect. The best defense is temperature control and a quick wrapper check on anything new before it joins the rest of your humidor. For the humidity and setup routine that keeps beetles and dried-out cigars both from becoming a problem, start with how to store cigars.