Wow....this is a touchy topic and I just have to reply but will try to be tactful.....lol.
I have a dog and both my DH and I smoke in the basement. Yes, pet dander can be a problem for people with allergies. But this should not be a problem if completed article is laundered or dry cleaned.
Smoke oder is simply an annoyance - and that comes straight from an allergist! This, too, can be alleviated with laundering. The flip side of the coin is fabric that is perfumed for those of us with perfume (musk) allergies.
I recently moved from CA to MN and joined a quilt guild to make new friends and enjoy the sharing. They meet twice a month and I was traveling 45 miles one-way to attend. At first I thought people were different in the midwest because no one seemed interested in getting together or "allowing" me to attend their retreats. Finally, a member took me aside and told me the reason was because I was a smoker. I explained that I don't smoke around non-smokers or at retreats. Her response was that I would still smell like smoke! I didn't reply (and no longer go to guild) but couldn't help but think about all the women who use perfume that I am allergic to and yet I never said anything - just tried to hold my breath or avoid.
Thank you for allowing me to vent!