Burning frankincense releases a fragrant smoke that has measurable effects on your brain, the air around you, and potentially your respiratory system. It’s been used in religious and spiritual ceremonies for thousands of years, and modern research has started to explain why: the smoke contains a compound that activates specific receptors in the brain linked to mood regulation, producing calming and mood-lifting effects. But it also generates significant particulate matter, so how you burn it and how well your space is ventilated matters.
How Frankincense Smoke Affects Your Brain
The most striking finding about burning frankincense comes from a study published in The FASEB Journal. Frankincense resin contains a compound called incensole acetate, which activates a specific type of ion channel in the brain called TRPV3. When researchers tested this compound in mice, it produced both anti-anxiety and antidepressant effects. Mice given incensole acetate spent significantly more time exploring open, exposed spaces (a sign of reduced anxiety) and showed less helpless behavior in swim tests (a standard measure of depressive symptoms).
The key detail: these effects disappeared entirely in mice that had been genetically engineered to lack TRPV3 channels, confirming that the compound works through this specific pathway. The compound also changed activity patterns across several brain areas involved in emotional processing, increasing activity in regions like the amygdala and lateral septum while reducing it in areas like the motor cortex and hippocampus. This suggests burning frankincense doesn’t just smell pleasant. The smoke carries biologically active compounds that interact with your nervous system in ways that could explain why so many cultures have used it to create a sense of calm during meditation and prayer.
Antimicrobial Effects of the Smoke
There’s preliminary evidence that frankincense smoke can reduce certain airborne microbes. In laboratory testing, researchers exposed bacterial and fungal cultures to frankincense smoke for two hours and found susceptibility among several types of organisms, including three types of gram-positive bacteria, one mold, and one yeast. This aligns with older traditional practices of burning frankincense to “purify” spaces, though the research is still limited in scope. Lab plate exposure is a far cry from reliably disinfecting a room, so this shouldn’t be treated as a substitute for proper hygiene or ventilation.
What It Does to Your Air Quality
This is where the tradeoffs become important. Burning frankincense generates a surprising amount of fine particulate matter. Per gram burned, incense produces roughly 45 milligrams of particulate matter, compared to about 10 milligrams from a cigarette. That doesn’t mean burning a piece of resin is equivalent to smoking, since you inhale cigarette smoke directly into your lungs, but it gives you a sense of how much material enters your air.
A study measuring PM2.5 (fine particles small enough to penetrate deep into your lungs) in homes where incense was burned found that concentrations during a burning session averaged around 201 micrograms per cubic meter, with peak spikes reaching over 825 micrograms per cubic meter. For context, the World Health Organization recommends average daily PM2.5 exposure stay below 15 micrograms per cubic meter. Incense burning increased the average indoor PM2.5 concentration by 120% compared to homes without it. The smoke also contains carbon compounds, sulfur and nitrogen oxides, and formaldehyde.
For most healthy people burning frankincense occasionally in a ventilated room, this isn’t a crisis. But for anyone with asthma, COPD, or chronic respiratory conditions, the effects can be serious. The American College of Allergy, Asthma & Immunology documented a case of an 87-year-old woman with asthma and COPD whose unexplained worsening shortness of breath was traced directly to daily incense burning. Potential symptoms from regular exposure include headaches, respiratory irritation, skin sensitivity, and allergic reactions.
Different Types Produce Different Aromas
Not all frankincense is the same. The resin comes from several species of Boswellia trees, and each produces a distinct scent profile when burned. Boswellia sacra (sometimes called carterii), the most prized variety from Oman and Somalia, is high in alpha-pinene and limonene, giving it bright, lemony top notes. It’s often burned on its own, especially the higher grades, because the aroma is complex enough to stand alone.
Boswellia serrata, which grows in India and is the type most commonly used in Japanese incense, has a different chemical makeup. It’s higher in alpha-thujene and contains very little limonene, producing a warmer, less citrusy scent. If you’re buying frankincense resin to burn, the species matters more than most sellers advertise.
How to Burn Frankincense Resin
Frankincense in its raw resin form doesn’t burn like a stick or cone. You need a heat source and a fireproof setup. Here’s the basic process:
- Equipment: A heat-safe incense burner filled with sand or ash, natural charcoal tablets (chemical-free bamboo charcoal is ideal), tweezers, and a lighter or candle.
- Light the charcoal: Hold a charcoal disc with tweezers and light one edge. Place it in the center of your burner on top of the sand or ash, which allows air to circulate underneath.
- Wait for it to heat: Give the charcoal 2 to 4 minutes until at least three-quarters of it is glowing and the surface turns light grey.
- Add the resin: Sprinkle a small amount of frankincense resin on or next to the hot charcoal. It will begin to melt and release fragrant smoke. Add more as desired.
A few practical notes: never leave burning charcoal unattended, and don’t discard used charcoal until it has cooled completely, ideally overnight. Hot charcoal fragments can start fires and cause burns long after they stop glowing visibly. Open a window or keep a door cracked while burning to prevent particulate buildup, especially if you burn resin regularly.
Reducing the Risks
If you enjoy burning frankincense but want to minimize the respiratory downsides, a few adjustments help. Keep sessions short rather than letting resin smolder for hours. Burn in a well-ventilated space, ideally near an open window where air can circulate. Use small amounts of resin at a time. If you notice headaches, throat irritation, or breathing difficulties, those are signs your exposure is too high. Electric resin warmers that heat frankincense without combustion are an alternative that releases the aromatic compounds with significantly less particulate matter, since much of the harmful output comes from the burning process itself rather than the resin’s volatile oils.