Welcome to HealthcareMagic forum.
Breathing problems associated with more than one cause. Lung pathology is one of the causes.
If a chest examination, X-rays and lung functions are normal, then you need not worry about lung pathology.
But continued marijuana use can pose threats to future lung problems and need to stop. Meanwhile you may be investigated to rule out other causes such as anemia
and reduced cardiac functions.
Hope this answers your query.