I think it's addictive because I used to smoke 2-1/2 to 3 packs a day. After trying to quit, tired of dealing with fast heartbeat, high blood pressure and dizzy spells I found that nicotine was certainly addictive. Patches, lozenges, gum, I'll take it all and still smoke.
One of my employees got a high nicotine vape pen for his birthday and didn't like it. He gave it to me. That was my last cigarette. Never even wanted one. Over time I reduced the nic content to zero. Then I just quit vaping. My pen broke and a replacement was too expensive.