"The Dog-Eared God" by Frank Belknap Long

Published in 1926

De Quincey: Thomas De Quincey, in this case referencing his book "Confessions of an English Opium-Eater"

Riverside Drive: as this story is set in New York, this would be a road on the west side of Upper Manhattan along the Hudson River.

Cyrano: Cyrano de Bergerac, a play by Edmond Rostand. Cyrano is a nobleman in the French Army, very talented as a musician, poet, etc., but has an obscenely large nose...

panetela: a long, slender straight-sided cigar

The picture used is the illustration for the story from Weird Tales, by G.O. Olinick

To follow along: https://en.wikisource.org/wiki/Weird_Tales/Volume_8/Issue_5/The_Dog-Eared_God