Quit Cigs cold turkey and moderate weed

I am on the 3rd week of cold turkey quitting smoking cigs, ever since i have been active, but I have had a shortness of breath as if I for get to breathe..i do have a stressful life as a young professional who is busy and so a have supplemented my quitting with a little weed at night to relax. My sex drive has decreased (upsetting my girlfriend), im short on breath (worried I have asthma which I never have had symptom), I never cough up anything and i smoked a pack plus a day for 4 years and im 24. will I be ok, the shortness of breath thing is getting to me, any help would be nice. I will not smoke again, but the cravings have not stopped and im pretty difficult to be aorund sometimes.

JJK