I'm puffing all day. I don't time it, I don't weigh it, I don't measure it, except to keep an eye on the contents of my tubs, tins, and jars. I've got about 12 pipes I rotate and they vary in size. I smoke a lot of OTC and bulk blends.
I haven't smoked a cigarette since I bought my first pipe last spring. I don't inhale my pipes, but I am aware of my need for nicotine, which is satisfied with mucosa induction and retrohale.
I retrohaled part of a cantaloupe last night. I was savoring the taste of a bite of it and when I swallowed, I sort of automatically pushed some back into my nasal passage. I've also done that with my beverages which are either tea or coffee. When 'it happens' I just laugh at myself.