Thanks for your replies and advice.
Just checking in again at 18 days.
I am finding I am getting cravings more often at the moment but they are shorter and less intense than earlier on, which is strange.
I have realised that giving up was the easy bit. I did that 20 times every day for about 30 mintues at a time. I also now understand the addiction aspect which for me is the scary bit. I know if I have one puff that is the end of this.
I think the fear of that is now working in my favour though, if that makes sense.