As a professional brass player (I play the french horn) I’m was more naturally inclined to be a mouth breather, totally bypassing the nose most the time. To really fill the lungs with air, in a quick second, the mouth is the way. Snuffing taught me to chill and slow down my breathing, and use my nose more in daily life, when not playing the horn. The various scents of snuff brought about an awareness of scent,  and wanting to truly smell things again assisted in my desire to quit smoking. I now feel like a hound dog with a nose built for sensing even the faintest scents.