Definify.com

Webster 1913 Edition

Adj.

[From Fume.]

Smoky; hence, fond of smoking; addicted to smoking tobacco.

fumacious ‎(comparative more fumacious, superlative most fumacious)

Smoky.
Fond of smoking tobacco.
- 1861, Atlantic Monthly
  Rustic females who habitually chew even pitch or spruce-gum are rendered thereby so repulsive that the fancy refuses to pursue the horror farther and imagine it tobacco; and all the charms of the veil and the fan can scarcely reconcile the most fumacious American to the cigarrito of the Spanish fair.