I used to smoke up to 4 PPD (unfiltered) plus a can of snus. I managed to quit overnight, even with the primitive e-cigs of the day - stick batteries and cartos. I found that I really disliked the tobacco flavored e-juices within a month or two. I never needed another smoke or dip of snus nor craved one. (I did smoke a single (actually partial - ugh!) "commitment cig" on my vapiversary for a couple of years, but forgot on my 3rd or 4th, and never did it again.) That was a bit over six years ago.
When I first began vaping, I tended to hang out with smokers when they went to "smoking allowed" locations - usually outdoors. I'm not sure whether it was for the camaraderie or for the smell of the smoke (more sidestream than secondhand). This went on for two or three years after I quit. It took me that long to begin to dislike even small amounts of tobacco smoke (whether sidestream, secondhand, or stale (the worst)). Now, at 6+ years, I can hang out with smokers (at least outdoors with a breeze), but now I'm sure it's for socializing, because I certainly no longer like the smell at all.
How much I now dislike the smell of smoking (even smokers who are not actually smoking at the moment) drives home to me (and still embarrasses me) just how offensive I was as a 4 PPD smoker. I was really a nasty-smelling person for the 45 years that I smoked. I am astounded at what my family and friends were willing to put up with.
I now vape totally unflavored e-juice (I vape exclusively for the nicotine - a lot of it; 65 mg/ml). As a side note, when I quit using flavoring in my e-juices, my wife commented that the vapor no longer smelled "perfumey"; not bad exactly, but perfumey. (It was very small amounts of Sour Cherry or Sour Green Apple.) So, depending on the strength and type of flavors that vapers use, it may be possible to still offend to some extent.