I personally quit a few months before i started LC, but I can't believe what a good choice it was to start the WOE soon afterward...
Because you are at a point that you feel really good, and you are successful at your weightloss, you will feel similiar results with quitting smoking. I think now would be a perfect time. Also the fact that you are limited to how much you can 'binge' on if you do get the munchies, you won't be tempted to reach for sugar or flour (which rules out quite a few of those foods that would make you gain weight if you quit and weren't on LC). And i would imagine that even increasing your intake of calories a bit with legal foods wouldn't increase your weight... Good Luck!!