I had to stop smoking as the cost was getting outrageous (at near $AUD 50 a packet of 25) and I was constantly coughing.
I just got so fed up with the need to smoke that I just set a date and time and that was it. I emptied the ashtrays, washed them and put them away in the cupboard. I used to re-roll the "bumpers" and i soaked them in water this time so I wouldn't be tempted.
It's very easy if you really have had enough - I smoked for almost 50 years and it was no big deal.
It can be done if you truly want to do it.
Best of luck to you if you feel the same as me about smoking.