I hate cigarette smoke, when somebody is smoking nearby I just feeL this dense black layer of smoking tar filling my healthy lungs. As long as passive smoking was proven to be very harmful to one's health I'm not going to tolerate smokers around wasting my health.
My idea is inventing a new brand of cigarettes that would not emit any smoke into air, but condense it within a special filtering segment.
It would solve the problem of passive smoking 100%, plus the nicotine and tar produced could be easily recycled instead of polluting the atmosphere.
By the way, other kind of filters could be used for accumulating toxic substances produced by a car's engine. Every driver would dispose the exhausts of his/her vehicle on one's own instead of egesting them into environment!
I really hope these ideas will be realized soon, solving the problems of passive smoking and air pollution caused by cars...