It's hard to listen to non-stop bs (pardon me) and say nothing, but what can you do. It sounds like a defensive in-your-face before you ask me not to smoke here mechanism. I always just try to slip away, but if not possible...I will ask if they could smoke later or somewhere else. (Inside a car or inside without the windows open... is just indescribably miserable for me.)
Sadly, my own mother is very much like this...After decades of smoking, she now has a high BP, a scary smokers cough, COPD and it breaks my heart to see her so addicted to something that is so horrible. She was for many, many years very healthy despite smoking, but it isn't that way anymore. Smoking can be a slow killer, my mom is in her 60s btw.