As adjectives the difference between sniffy and snuffy
is that sniffy is disdainful; haughty while snuffy is soiled with snuff.
sniffy
English
Adjective
(er)
Disdainful; haughty.
characterised by sniffing.
:A sniffy cold.
snuffy
English
Adjective
(
en adjective)
Soiled with snuff.
(obsolete, Scotland) Sulky; angry; vexed.
- (Jamieson)