He never met that other master of the weird tale, H.P. Lovecraft, as Smith spent his life in California and Lovecraft in New England and New York, but they frequently corresponded. Here's Lovecraft, introducing himself to Smith:
What a world of opiate phantasy & horror is here unveiled, & what an unique power & perspective must lie behind it! I speak with especial sincerity & enthusiasm, because my own especial tastes centre almost wholly around the grotesque & the arabesque. I have tried to write short stories & sketches affording glimpses into the unknown abysses of terror which leer beyond the boundaries of the known, but have never succeeded in evoking even a fraction of the stark hideousness conveyed by any one of your ghoulishly potent designs.He signs the letter "Yr most obedient Servt. / HPLovecraft." In later letters, Smith addresses HPL as "E'ch-Pi-El" and signs his letters "Klarkash-Ton," an amusing little affectation.
"Cone Shaped Creature," Clark Ashton Smith