OMG yes!! I was there once.

I would "treat" myself to a smoke AFTER gym every night too. (It's disgusting now that I think of it)
The bad thing that I did was after a few months, I stopped working out as well which led me to BLOAT!! I don't know if there is a scientific explanation to quitting smoking and gaining weight but quitting does affect your body so many ways!!
It's been over a year that I quit and even though I just restarted this weight loss journey, I know I am waaaay better at gym NOW than I was when I was smoking!
Fret not, don't give into the urge and keep doing what you're doing! You just need to push through it. You WILL lose weight !! Hang in there!!