Actually I dont' think the analogy is valid. Tobacco is addictive, true. And tobacco has only one use. A smartphone has many use cases (mp3 player, camera, compass, notebook, encyclopedia and many more).

And why would you like to "quit internet"? Yes, many sites try to get your attention, try to manipulate you into buying their products. But you can avoid that. Using ad blockers wherever you can. And regarding Facebook. You can use it more like a newsreader (subscribing to newspapers, ignoring my friend's posts mostly).

Edit: Re smartphone. I also have my phone on `do not disturb', permanently. I try to educate my friends / family members that I don't necessarily pick up the phone when it rings, but I will always call back. They are ok with that.