Thing is, those cigarettes don't jump in your mouth and light themselves.
There are a number of thoughts required before you can smoke.
1. Knowing where your cigarettes and lighter are.
2. choosing a location to smoke
3. Picking up the pack
4. Taking a cigarette out of the pack
5. Putting it in your mouth
6. lighting it and inhaling
You can change the outcome during any of the first 5 steps.
If you've quit, the easiest thing you can do is not keep any around.
There is no emergency of any kind that will require smoking so keeping some around for emergencies is a self defeating excuse and empowers what you DO NOT want to empower.