The TLC show "My Strange Addiction" shows people with unusual habits, like smelling Pine-Sol and becoming obsessed with a doll head. Shannon's shocking addiction is drinking gasoline. She often drinks it straight out of the gallon, and sometimes licks the cap.
Shannon described the gasoline as sweet and sour, like a tangy sauce. "Even though it hurts me, it makes me feel good," she said.
Watch the video above.