It is absolutely never too late.
At the start of a quit - it is about the next hour, the next half an hour, the next minute. Easy Peasy or not, mental or physical - the addiction is there. The addiction tells the addict to administer.
At times, I quit hour at a time - I would say out loud - "OK craving. I hear you. I am not going to smoke now. I will not smoke for an hour - then we will talk again." Then I would think about my reasons for quitting. I would think about my wife. (She is terrified that I will leave her alone) I promised her that I would do anything that I could to be there for her. Willfully contributing to my own death doesn't fit with that promise ;)
Have you written it down Amy? Have you actually got a pen and some paper and written down why you want to quit (at some point)?
One of the first things that I learned - was that I am in control. I can - if I want to, go to the store right now, buy some cigarettes and smoke them. Will the world stop turning? Will life as we know it - cease? Nope. The vast majority of the world won't know, won't notice and won't care. I am not going to go buy some and smoke them, because I choose not to. Nothing more, nothing less.