The No-Smoking Alarm from Jin Ho Kim is designed to help keep public areas that are labeled as no-smoking smoke-free. These alarms sound when enough smoke is detected, which should help the rebellious smoker get the message to put it out.
I could care less about people smoking or not, but I am big on obeying signs. If a place is labeled no-smoking, then you don't smoke there. The No-Smoking Alarm would improve the health of every non-smoker by ensuring that no-smoking areas stay that way.