I will respect this forum and back down on further debate. As a relative noob, I did not understand this argument existed, nor do I wish to participate in it. If I've fanned the flames, I apologize.
Oh yeah, it exists. Not really worth going there. It's complicated.
Nicotine (alone) affects different people differently. We all know that. Nicotine in tobacco leaves + combustion is another can of worms. Whole tobacco alkaloids, MAOIs... you name it. The debate has been going on forever. Some people quit smoking the minute they get their first e-cig, then go to 0 nic, and many even quit vaping (and smoking) altogether. Others supplement vaping with snus or WTAs. Others can't quit smoking and become dual users.
Nicotine is addictive--so are caffeine, sugar, physical exercise, silly cat YouTube videos, alcohol, and smart phones. What's an addiction, anyway? I've been a social drinker my whole adult life; I have a glass of wine or a beer with my dinner almost every day--never became an alcoholic and I don't HAVE to have that drink. I just like it. But there are people who can't even be around alcohol without the risk of going down that rabbit hole after one drink.
There's no one size fits all when it comes to addictions. And everybody who tells you otherwise is not worth talking to.