Quitting is a process where we change our behavior one step at a time. Thsi often starts with a statement such as, "I'm not going to smoke in the house anymore." "I"m not going to smoke in my car." or after we quit, we tell ourselves, "I'm not going to smoke ever again."
But our brains are funny sometimes and the unconscious sometimes doesn't hear the word "NOT" because those kind of statments call for negative action or no action and we are hard wired to action or to do something. Try to NOT do something, it is easier to DO something than not do it.
Now look at those same statements: "I'm going to smoke in the house." "I"m going to smoke in my car." or after we quit, we tell ourselves, "I'm going to smoke." If this is what your brain is hearing, it can sabatoge your success.
So instead, turn your statements into positive, action statements of what you will do, not what you won't do.
"I'm going to smoke outside from now on." "I'll be smoke free in my car." "I choose to be smoke free."
When a craving comes up, instead of fighting against it by saying, "I'm not going to smoke, I'm not going to smoke." State what you will do. "I can go for a walk instead of smoking." "I can change the way i think about smoking." "I can do this."
Focus on what you want instead of what you don't want, what you will do and not what you won't do.