How do you feel about other adults smoking in front of your kids?

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I went to a park yesterday that was especially designed for young kids.Most of the equipment is not made for older kids. It is such a nice playground. It is great to see all the little kids playing around. My only problem are these smokers who just light up and act as if nothing is wrong. They walk around the playground and smoke in front of kids who are not theirs. I wish they had the decency to take a note of the windflow and walk a good distance away before they light up. How do you feel about other adults smoking in front of your kids?