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And anything that results in a sudden lack of oxygen or a reduction in blood flow to the brain can cause a seizure.
http://kidshealth.org/parent/firstaid_safe/emergencies/seizure.html
The surprising fact is that side-stream smoke has higher concentrations of noxious compounds than the main-stream smoke inhaled by the smoker. Some studies show there is twice as much tar and nicotine in side-stream smoke compared to main-stream smoke, as well as three times as much of a compound called 3-4 Benzopyrine, which is suspected to be a cancer causing agent. There is also 10 times as much carbon monoxide that robs the blood of oxygen and 50 times as much ammonia in second-hand smoke.
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Carbon monoxide is a colorless, odorless gas contained in tobacco smoke. When you inhale carbon monoxide, it destroys oxygen molecules in your red blood cells. As the amount of carbon monoxide increases in your blood, the cells of the blood become starved for oxygen. One study shows that after only 30 minutes in a smoke-filled room, the carbon monoxide level in a nonsmoker's blood increases along with blood pressure and heart beat. ...
http://www.sa.psu.edu/uhs/healthinformation/patientlibrary/health/secondhandsmoke.cfm