GRAFTON, Vt. (WCAX) - Police are asking the public for help finding a missing Vermont teen.Vermont State Police say Ethan Whitten, 18, of Grafton, was last seen Wednesday at about 3 p.m. near Brookline Road.Troopers say Whitten’s disappearance is not considered suspicious, but there are concerns for his welfare.Ethan Whitten's dirt bikePolice say Whitten was riding a red and white dirt bike. He was last seen wearing tan boots, red gloves and red “Fox” pants.Anyone with information is asked to call the state police in Westminster at 802-722-4600 or to leave an anonymous tip online.