Hi, this might be due to residual bronchospasm, you might be having COPD
. Did you ever had investigations like FEV, spirometery, PEF etc? If not, please get it done. COPD
is chronic inflammatory lung disease which is seen in smokers, irreversible bronchoconstriction happens in this disease.
Drugs like deriphylline, nebulised salbutamol or ipratropium will be helpful.