I quit smoking 1.5 yrs ago after smoking in and off for 13 yrs. i have no chest pain, no cough, and am physically active. why am i wheezing ?

Bronchospasm: You're describing asthma, a form of COPD. Smoking makes it worse, and you were wise to quit, but even "never-smokers" can get bronchospasm sometimes. There are many meds that help so please see your family doc.

Wheezing: Those symptoms may be a sign of asthma or mild emphysema. Suggest you see a pulmonologist for a complete evaluation which will include breathing tests

Airways disease: Smoking is a major cause of lung disorders but may combine with other exposures like pollution to affect your lungs. Sometimes a heart condition may lead to wheezing or you may actually have asthma previously unsuspected. Talk with your doctor about getting a check-up with a lung specialist. You may also need a cardiac check-up. Rarely, wheezing may also come from your throat (stridor).