noun
smokers forced to smoke outside; firefly tribe
A colloquial term for people who have to go outside to smoke, often at night, because smoking indoors is prohibited. The name comes from the image of their lit cigarettes glowing in the dark like fireflies.
最近、マンションの外でホタル族を見かけることが増えた。
Lately, I've been seeing more firefly tribe members outside apartment buildings.
彼もホタル族の一人で、夜になるとベランダでタバコを吸っている。
He's also one of the firefly tribe, smoking on his balcony at night.
Kanji spelling using 蛍 (firefly); less common but still seen.
Compound of ホタル (firefly) and 族 (tribe, group). The term likens the glowing tips of cigarettes seen outside at night to fireflies.