hi,
thank-you for providing the brief history of you.
A thorough examination of the lungs and musculoskeletal assessment is advised.
Since you were
smoking in the past and and heavy marijuana smoker as well, due to this, the lung tissue has become weak. Since the body was habituated for 3 years for the supply of
nicotine and now sudden stopping will also give some sort of symptoms which you need not have to worry much. If possible take a CT/
MRI of the lungs once to assess the lung tissues. Also a pulmonary function test is done to check the lung capacities.
I will recommend you to perform regular breathing exercises and respiratory muscle Strengthening exercises which a physical therapist will help you understand and learn.
Performing this after an initial Pulmonary function test and later after a month of practice redoing the Pulmonary Function test will help you understand your progress.
I have clinically seen cases with such complaints and they respond well to
physical therapy. A good amount of people regain their fitness of lungs back after
Pulmonary rehabilitation.
for any further query/doubts/suggestions you can feel free to contact me. I will happy to help you further from here.
Regards
Jay Indravadan Patel