Passive smoking is the involuntary inhalation of smoke from tobacco products. It occurs when tobacco smoke permeates any environment, causing its inhalation by people within that environment. Passive smoking is the act of breathing in secondhand smoke. Every passive smoker is at risk with exposure to environmental tobacco smoke. It causes the maximum damage to near and dear ones by damaging their developing organs, mainly the lungs and brain. Log on to: http://smokingharms.com to save your lungs and brain.
Passive smoking is basically secondhand smoke, and yes it can be harmful. If you google "passive smoking" it will bring up some info for ya :)