If you're eating 100+mg a day you will have physical withdrawal symptoms. This kind of consumption just hasn't been possible, or more likely affordable, for a large swath of the population until a few years ago.
I think your bigger concerns at 100+mg a day will be paying for your habit, and having a life outside of melting onto the couch and watching dumb YouTube videos
In this study 57% out of 1000 persons seeking treatment for drug and alcohol dependencies said that quitting smoking was harder than their problem substance.
https://jamanetwork.com/journals/jama/article-abstract/37628...
From this article: 'Heroin addicts say it is easier to give up dope than it is to give up smoking,'' says Dr. Sharon Hall, a psychology professor
https://www.nytimes.com/1987/03/29/magazine/nicotine-harder-...
I dont have personal experience with opiates, but do with nicotine and I can say it took 10-15 years before I didn't have a regular desire to consume nicotine. It was the hardest thing I've ever done.