I hope you will not give up on something that obviously means so much to you. One other thing you might try is to get a room air purifier to run in your sewing room. May not take care of all the smoke and pet hair but, they do help. My husband and I have allergy problems and we have one in our bedroom. Amazing what the filter looks like when I clean it. (Don't forget to clean filter frequently) Just one more idea to try. Never, Never give up on a DREAM!!!! Good luck and God Bless your endeavors.