“Marijuana use was found to have little to no association with poor pulmonary health in older current and former tobacco smokers after adjusting for covariates.
Among older adults with a history of tobacco use, marijuana use does not appear to increase risk for adverse lung function. ”
My twin sister was diagnosed with COPD few years ago. She was on a trial for some months. It turned out that the drug she was given was not a placebo, but the real thing and it was working. Then they pulled the plug on it saying it was not viable! So. they got her on another trial, that trial also was cancelled after a while. 2017 I ordered COPD herbal remedy from Best Health Herbal Centre online and they shipped it to me. She only used the COPD herbal remedy for 5 weeks, all her symptoms disappeared, she stopped wearing oxygen and my family doctor confirmed her, COPD free now. Is almost 5 months now, no more COPD.