It has been tough, I have to admit, but the real challenge is mental and for the first 4 to 6 weeks. It’s definitely crucial to supplement the change with a new hobby (preferably exercise). Right up to a couple of months ago, it was still the odd temptation when you are around friends in a pub, but you get into the new habit of understanding why you were doing it and why you are feeling the urge. It was a great drug for a while, but am glad the addiction’s over.