Then why are you worrying about something you have total control over?
You have more than ample opportunity to avoid a situation where tobacco smoke is present; and in those situations where you might be in its presence, let's face it - they must be rare.
Do you honestly think these rare situations are going to affect your health?
For crying out loud, lighten up.
Worry is going to kill you, not "second-hand" smoke.
It seems from ALL your posts to me, you have my entire life figured out; who I deal with, where I travel....
Maybe you can help Miss Cleo out a little.