Final answer:
The age range with the highest use of tobacco, marijuana, and stimulants is early adulthood, covering the 20s to early 30s.
Step-by-step explanation:
The age range with the highest use of tobacco, marijuana, and stimulants is early adulthood, which corresponds to the ages of early 20s to early 30s. During this stage of life, many individuals engage in experimentation and are establishing their lifestyles, which may include the use of substances. Furthermore, studies suggest that peak drug use often occurs when individuals are establishing independence and testing societal boundaries.