I was about to say the same thing re muscle weighing more than fat. I expect you've been more physically active since you quit (you've been cycling and generally running around in order to keep your mind off smoking) so you're reaping the benefits.
I've done the same thing, since quitting I've been running a lot and now all my clothes are too big and there is a noticeable difference in my size but I haven't actually lost any weight. I can see all my legs and abs are all toned up now and muscle is much denser than fat so weighs more but is smaller.
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