I smoked for 25 years. Then during an annual medical the doctor suggested I give it up. So at the start of a long weekend I gave my lighter to my assistant, and told myself "If I can get through the long weekend it would be a good start". That was difficult but I made it. The next working day was a Tuesday. I said to myself "If I can make it till Friday, I will be almost there".Did that. That was 32 years ago. The chemotherapy and radiation to fight my lung cancer wasn't so bad.
You can do it too, hopefully sooner than me.