I didn't mean people who are allergic to smoke per say. I just mean that smoking makes anyone with breathing issues more uncomfortable than they need to be (ie it compounds seasonal allergies/asthma).

But you are correct, it was a bad example. I don't have allergies/asthma and smoking troubles my breathing, so I can't even imagine what it does to people who already have problems. I should have just sited general breathing discomfort as an alternative to the cancer thing rather than select out a specific group that are bothered by it.