Two things you -could- do, that are 100% legal. You just have to have the cojones to actually do it.
If someone chooses to drop their cigarette butt on the ground, pick it up and hand it back to them and tell them, politely and with kindness in your tone, "Oh here you go, you dropped this, sir.'
If stinky cigar smoke is making you ill and you're somewhere that moving upwind is not practical for you, pick up a menu, a piece of paper, a portable menopause fan (they exist), and fan or blow the smoke right back to their own faces. Remain at a respectful distance; your fan/paper/menu will do the work without you violating "this is MY space" rules of etiquette.
I have done each of these things, at least once. Possibly a couple of times.
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