That means you are not addicted to the ciggy.
It's just a habit you can kick.
When a non addict smoke it's usually out of boredom, like some
people like the rocking motion on a rocking chair.
keep yourself busy.
I was a chain smoker before. After my new bf complain he cannot
stand my stinky mouth, I reluctantly quit.
Your girlfriend maybe cannot tahan your stinky mouth and body
smell, finds it repulsive, that's why she wants you to quit.