I have never sneezed when vaping even during my oral surgeries where I straight up NOSE vaped. Yep. In through then nose out through the nose, drip tip shoved up nose.
I will say the nose membranes are great for absorbing nic. I used a lot less (This may have in PART been also because it was a lot HARDER to get a nice long drag, etc.)
Too much snus makes me sneeze sometimes. It's always fantastic to have a bunch of black goo in your hand (also why I do not overdo snus at work, unless I KNOW I will be alone in my office for, oh, an hour.
Anna