Which of the following is a harmful effect of cannabis?

Psychosis is recognized as a harmful effect of cannabis, particularly in individuals who may be predisposed to mental health issues. This condition can manifest as delusions, hallucinations, and a disconnection from reality, which can severely impair an individual's functioning and quality of life. Studies have shown a correlation between heavy or early use of cannabis and the onset of psychotic disorders, especially in vulnerable populations.

In contrast, the other options do not accurately represent harmful effects. Increased motivation, improved concentration, and enhanced social interactions are often considered potential benefits or less severe effects of cannabis use for some individuals, rather than harmful consequences. Understanding the serious implications of psychosis can help individuals make informed decisions about cannabis use and its potential risks.