I am going to jump in here. At this time time there are no legitimate, effective FDA approved stem cell treatments. Unfortunately the private companies that offer stem cell treatments are not proven to be effective nor are they proven to be safe. There are lawsuits and the FDA is attempting to shut them down. Here are links to official statements on stem cell treatment by reliable trustworthy organizations...

American Lung Association https://www.lung.org/our-initiatives/research/about-our-research/stem-cell-therapy.html
COPD Foudnation https://www.copdfoundation.org/Take-Action/COPD-Policy-Issues/COPD-Foundation-Position-on-Stem-Cell-Therapy.aspx
FDA https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm286155.htm
And an assembly of world wide organizations https://www.thoracic.org/members/assemblies/assemblies/rcmb/working-groups/stem-cell/resources/statement-on-unproven-stem-cell-interventions-for-lung-diseases.pdf

There is legitimate stem cell research being done so we might have an option in the future but unfortunately not today.