I never found nicotine addictive. It never compelled me to increase my consumption beyond a few cigarettes a day, usually in social settings. I never became a regular purchaser of cartons of cigarettes. It was purely a social activity as most my peers were smokers and participating in the smoke breaks was a huge part of socializing. But it never escalated beyond that, there was simply no draw and stopping cold-turkey was completely uneventful with zero physiological effects.
Coffee however, has such a profoundly stimulating effect on me, it completely derails my life for days after a lone day of consumption. It's a very on-vs-off modal existence, and if I fall into the on mode for more than a couple contiguous days, I begin craving it and actively seeking it out. And when I manage to finally resist those cravings, I end up going through ~three days of hangover-like withdrawal hell which if I'm not up for enduring will just push me back on the wagon to make it stop.
For me, coffee/caffeine is far more sinister and addictive than cigarettes.