Toxic particles in cigarette smoke can remain on nearby surfaces, as well as the hair and clothing of the smoker, long after the cigarette has been put out, and small children are susceptible because they are likely to breathe in close proximity, or even lick and suck them.

BBC: Warning over 'third-hand smoke'

Whether he was a homeless person camping, or a golfer who threw a cigarette out onto the golf course and then tried to put the flames out.

NPR: L.A. Fires Force Evacuation of Park, Zoo