The point of no return? Hey you've managed it longer than I have, so maybe you'd know if there is one. For me, I dunno, since the initial cravings wore off after the first week I've not really had an issue. Yes I've occasionally thought "oh it'd be nice" or it's just popped into my head that I could have one, but it's not a craving, just a thought, and it passes as soon as I ignore it.
In fact I walk past people on the street and see them smoke and feel a bit sick. So even with the odd thought and people smoking I don't get tempted. I think of how proud I am of myself for doing something I never thought I'd be able to do, especially while having problems with anxiety and it keeps me strong.
Who knows, maybe I'm being naive, but I don't consider myself a smoker any more, I hope I never start again and the thought I won't doesn't fill me with dread.
Good luck with your attempt as I said, need some words of support shout and we'll all come round and hide your fags