U need to get yourself examined by a physician/Pulmonologist. Breathlessness at the age of 22 assuming u smoke since 4-5 yrs can actually precipitate allergic bronchitis, smoking induced bronchitis, bronchial asthma which will be associated with wheezing as well. Along with the examination u need a chest xray to ascertain the probable cause and then further course of action can be taken
Next Steps
visit a qualified physician, Pulmonologist
Health Tips
stop smoking, take steam inhalation( without any medication) twice daily