This image has 4 line graphs that show how rats first exposed to nicotine in adolescence show greater sensitization to cocaine than rats first exposed as adults. The data for each category follows:

Adolescent Male Rats Activity Level*:

Adult Male Rats Activity Level*:

Adolescent Female Rats Activity Level*:

Adult Female Rats Activity Level*:

*Activity level after cocaine administration was measured by counting the number of times in 10 minutes each rat crossed light beams projected in a grid across its cage.