Marijuana can cause mood changes marked by anxiety, sadness, laughter, and paranoia. Another claim they are more artistically creative although objective research does not support this.
On the perceptual level, many people report feeling more introspective and sensitive to external stimuli when they are using marijuana. One study found that adolescents who used marijuana had higher rates of schizophrenia or related conditions as adults. What one person may view as desirable or euphoric may be undesirable to another. Psychological effects are subject to interpretation. Therefore, most users report euphoria, as well as relaxation, often followed by sleepiness. Marijuana increases the release of dopamine, a neurotransmitter involved in the experience of euphoria.
Many variables influence the psychological effects of marijuana.