A thought for a cigarette will never cause a person to go back to smoking-only an action can do that. The action is a puff on a cigarette or any administration of nicotine from any source for that matter.
Thoughts or words are not decisive factors of anything. Lets say you never quit smoking, and are eventually diagnosed with emphysema, and then knowing that every puff you took was destroying more and more lung tissue, basically crippling you a little bit more every smoking moment.
Should you then feel solace for saying as you are lighting up a cigarette, "Yes, I know I am destroying more lung tissue and I am likely going to be on oxygen soon and gasping for air at some point until my heart finally gives out from the overload, but at least I thought about quitting today."
I don't think you or your family, friends, or doctor will look at this statement as a major accomplishment as you are lighting up one cigarette off the one that is about to burn out. Especially if you have said the comment earlier that same day, and have been saying it day after day for decades now.
If you think back to when you were first quitting, the odds were you had numerous thoughts for days and maybe weeks and still, here you are smoke free. It is because you never gave into those thoughts.
Today still your actions are speaking louder than your words or your thoughts. The action is you didn't take a puff yesterday and I strongly suspect if you are here reading now you are not planning on taking one puff today either. As long as you continue this practice, it does not matter if you never think of a puff again or if you think of it daily. You will never relapse as long as you never take another puff!