Happy to be at just over 12 weeks and definitely grateful for only the few cravings I get in a week now!! While I feel better overall, I'm wondering if anyone has experienced a occasional fast heart rate and times of breathlessness after quitting? both typically go up after eating lunch and usually only once a day. The "out of breath" feeling is the same. I walk an hour every morning and do not get out of breath... but later in the day, I do (or at least it feels like I do). Otherwise my resting heart rate has been in the 70s and my heart rate at work has been in the low 80s (much lower than my pre-smoking BPM of 94+ at rest).