Yes!
Well done quitting smoking, it's a big achievement. I quit on March 13th this year. Most of my apnea practise has to be dry because I don't have a buddy near where I live. I find that my breathe-ups have to be very gentle... Just 2 quick deep breaths can bring on an intense feeling of hyperventilation so now I breathe slowly through my nose during breathe-ups, either using the 5seconds in and 10seconds out method, or the 2, 4, 2 method (count to 2 while inhaling, hold for a count of 4, then count to 2 while exhaling, then repeat).
When I was a smoker it was also very easy to hyperventilate, but since stopping I have to be extra-careful. If my breathe-up is slightly forced my head goes fuzzy, and my hands and feet can get a tingling and numb feeling, like if you lean on your arm or leg for a long time restricting the blood supply. Since stopping smoking I have had to abandon at least one training session every week because the dizzy, tingling and numb sensations were so strong.
On the positive side I've broken the 5minute barrier and gone on to 6:05 in the short time since I quit, and I can run up hills now! So definitely more 'breath' for me too!
How long since you quit, and what sort of feelings do you experience?