Hi, welcome to the forum, long term smoking of Marijuana is associated with many symptoms of obstructive pulmonary disease: airflow obstruction, chronic cough, bronchitis, and decreased exercise tolerance.
Hence, from your history it suggests that you are experiencing airflow obstruction (not allergy) due to hyper reactivity to marijuana. As such marijuana is not associated with allergy.
If you continue for long term you can develop large air filled spaces of alveoli in lungs (bullae) which can reduce vital capacity. Sometimes associated with pneumothorax which leads to sudden breathing difficulty. Four marijuana cigarettes per day is equivalent to 20 tobacco cigarettes per day.
Finally, you need to quit smoking pot, and it will save your lungs. You can undergo chest X-ray to rule out any changes in lungs. Go for morning jog which will help to retain your vital capacity and also increases your oxygen saturation.
Take care and regards.
My son used to smoke it and ended up with seizures! STOP SMOKING IT!
It's a lot more dangerous than people are aware of and often leads to other drugs.