Why the Retrohale Matters
Human flavor perception is approximately 80% olfactory. The mouth detects the five basic tastes (sweet, salty, sour, bitter, umami) plus some texture; everything else is registered by the olfactory bulb. When smoke passes through the mouth and is exhaled through the lips, much of the cigar's flavor compound information never reaches the olfactory pathway.
When the smoke is exhaled through the nose (retrohale), the flavor compounds reach the olfactory bulb directly. Cigar nuance — the cocoa-cedar-pepper architecture of a fine Cuban, the dried-fruit-coffee evolution of a Nicaraguan maduro — is fully readable only through the retrohale.
The Technique
Draw smoke into the mouth. Hold for 2-3 seconds. Then, with the mouth closed, exhale slowly through the nostrils. The smoke should pass through the back of the throat and out the nose without burning.
The first retrohales of any session feel uncomfortable; the technique requires practice. Within a few cigars, the technique becomes automatic. Most aficionados retrohale 2-3 times per third of the cigar, using mouth exhalation between for normal smoking pace.
What Each Third Reveals on the Retrohale
First third: the wrapper character is most identifiable. Connecticut shade reveals cream-and-cedar; Habano sun-grown reveals leather-and-spice; Connecticut Broadleaf reveals cocoa-and-coffee.
Middle third: evolution emerges. The mouth tastes the steady-state; the retrohale catches the developing notes (dried fruit emerging, spice intensifying, the wrapper character receding into a base layer).
Final third: peak concentration. The retrohale at the final third typically delivers the cigar's most-dramatic flavor architecture, sometimes overwhelming for full-bodied maduros.