Which stimulant is known for producing euphoria, reducing hunger, deadening pain, and boosting self-confidence?

Cocaine is known for its powerful stimulating effects that produce feelings of euphoria, increase self-confidence, and significantly reduce hunger. It achieves these effects primarily by enhancing dopamine levels in the brain, leading to pleasurable sensations and an elevated mood. In addition to it being a stimulant, cocaine also has anesthetic properties, which contribute to its ability to deaden pain. This cocktail of effects makes cocaine particularly notorious in both recreational use and discussions about substance use disorders.

While nicotine can also act as a stimulant and produce mild feelings of euphoria, it does not have the same level of intensity in terms of euphoric effects or significant appetite suppression as cocaine. Marijuana, on the other hand, is primarily known for its psychoactive properties and can alter perception but does not function as a stimulant in the traditional sense. Lastly, LSD is a hallucinogen that alters sensory perceptions and can lead to profound changes in thought processes and mood but does not typically enhance self-confidence or reduce hunger in the same way stimulants do. Thus, cocaine is distinctly recognized for the specific combination of effects mentioned in the question.