Which drug is known for its high potential for addiction and is classified as a stimulant?

Cocaine is classified as a stimulant and is well known for its high potential for addiction. As a powerful central nervous system stimulant, cocaine increases levels of dopamine in the brain, which contributes to its euphoric effects. The drug affects the brain's reward pathway, leading to intense cravings and a pattern of compulsive drug-seeking behavior.

This addictive quality is significant because it can lead to serious health problems, including cardiovascular issues, neurological complications, and a range of psychological disorders. Users often find themselves needing to consume larger amounts to achieve the same effects, exacerbating the addiction cycle.

In contrast, while caffeine is also a stimulant, it does not carry the same level of addiction potential as cocaine. Marijuana is not classified as a stimulant but rather as a depressant or hallucinogen, and heroin is an opioid, which has a different mechanism of addiction primarily centered on pain relief and euphoria. This context highlights why cocaine is the correct answer regarding high addiction potential among stimulants.