Which of the following is a common consequence of stimulant misuse?

Stimulant misuse typically leads to various psychological and physiological effects, and one of the most notable consequences is the onset of anger and paranoia. Stimulants, such as cocaine or amphetamines, can significantly alter an individual's mood and mental state. The heightened energy and euphoria they produce can quickly turn into irritability and aggression, especially as the effects wear off. Additionally, the stimulating properties can heighten anxiety levels, leading to paranoid thoughts.

The other options—weight gain, polydrug use, and excessive sleepiness—are not commonly associated with stimulant misuse. Instead, stimulant use often leads to decreased appetite and weight loss, increases in polydrug use can occur but are not an inherent consequence of stimulant misuse itself, and excessive sleepiness is typically seen when the effects of stimulants subside rather than during active use.