“1 delta1-trans-tetrahydrocannabinol, (delta1-THC) produces bronchodilatation in asthmatic patients. 2 Administered in 62 microliter metered volumes containing 50–200 microgram by inhalation from an aerosol device to patients judged to be in a steady state, it increased peak expiratory flow rate (PEFR) and forced expiratory volume in 1 second (FEV1). 3 The rate of onset, magnitude, and duration of the bronchodilator effect was dose related.”
https://www.ncbi.nlm.nih.gov/pubmed/656294
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1429361/
“Bronchodilator effect of delta1-tetrahydrocannabinol administered by aerosol of asthmatic patients. The mode of action of THC differs from that of sympathomimetic drugs, and it or a derivative may make a suitable adjuvant in the treatment of selected asthmatics.” https://www.ncbi.nlm.nih.gov/pubmed/797044
“Bronchodilators are medications that open (dilate) the airways (bronchial tubes) of the lung by relaxing bronchial muscles and allow people who have difficulty breathing to breath better. Bronchodilators are used for treating:
- Asthma
- Chronic obstructive pulmonary disease (COPD
- Allergic reactions
- Related conditions that cause breathing problems”
https://www.medicinenet.com/bronchodilators_for_asthma/article.htm