It is not uncommon for a person to note an increase in cough and mucous production after quitting smoking. This usually subsides spontaneously, but may not stop entirely for 6 months or more. However, your description suggests that the onset of your cough, sputum and wheezing was only 3 months ago, so we must not assume that it is related to smoking cessation. Rather, the assumption should be that these are signs of bronchitis and/or asthma or, perhaps, exposure to a pulmonary irritant, allergen or infection.
I strongly suggest that you now seek medical attention for it is highly likely that your symptoms will clear with proper therapy and equally likely that they will not clear if you receive no treatment.
The good news for you is that the pulmonary function test results (FEV1 and FEV1/FVC) show that you still have good lung function, even after 23 years of smoking and that you have quit in time to preserve your lungs. The measurement FEF 25/75 is abnormal and undoubtedly secondary to smoking. It is unlikely to be associated with shortness of breath but should serve as a warning to you that, having quit smoking, you should never resume smoking.
Good luck
i will see a pulmonary specialist next week for my symptoms and YES, i will never go near a cigarette ever again.
thank you for your expert advice,
alex