I have a friend who believes that I can't say I stopped smoking as I have taken it up again (I have given it up and taken it up again a few times before).
I believe that I can say, "I gave up smoking", and that "I stopped smoking", even if I had/have taken up/begun this foul addiction again.
I stopped smoking 30 years ago, but I have taken it up again a few times since then.
I gave up smoking 30 years ago, but I took it up again.
Just because I have taken up smoking again, does it mean that I can't say I stopped smoking at a particular time in the past?
That is, is stopping permanent, or can it be temporary?