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12, 1982.OKLAHOMAN FILE PHOTOOU football coach Barry Switzer dons the famous "Beat Texas" hat during the 1984 Red River game in Dallas.OKLAHOMAN FILE PHOTOOU football coach Barry Switzer waits with his team in 1980.OKLAHOMAN FILE PHOTOOU running back Greg Pruitt looks over X's and O's with Sooners assistant coach Barry Switzer in 1971.OKLAHOMAN FILE PHOTOOklahoma coach Barry Switzer gets a ride from jubilant players Tony Casillas, left, and an unidentified player, right, following their win over Penn State in the Orange Bowl college football game in Miami, Fla

Oxygen levels: Tobacco smoke contains carbon monoxide, which reduces the amount of oxygen in the blood

Continued smoking is also associated with an increased incidence of complications in people with Crohns disease, some of which may require surgery

One expert says that a factor in the rise in marijuana use is that teens perceive the drug to be less harmful to their health than cigarettes