Use some common sense. Make it difficult to fail, not easy.
Having to get up, find your keys, walk to the car, unlock the door, get in, put the key in the ignition, back out of the driveway at 75, turn to look at the car you ran into, leave the scene of an accident, race to the mini mart running red lights and evading the police, open their door, push three people out of line, throw your $20 on the counter screaming, GIVE ME MY CIGARETTES, and get handcuffed as you leave the store with the helicopter circling overhead?...Each of those is a moment you could have caught yourself and said "I don't do that anymore"
Now, you're back in smokers jail.
So why would you keep them around? You are setting yourself up for the easy way OUT OF YOUR QUIT.
There is no such thing as an emergency pack because there is no emergency that requires smoking.
**If you live with a smoker, part of your decision and commitment must be not thinking their smoking materials ARE YOUR SMOKING MATERIALS.