Cannabis has mental and physical effects, such as creating a "high" or "stoned" feeling, a general change in perception, heightened mood, and an increase in appetite.[1][23] Onset of effects is felt within minutes when smoked, and about 30 to 60 minutes when cooked and eaten.[22][24] The effects last for two to six hours.[24] Short-term side effects may include a decrease in short-term memory, dry mouth, impaired motor skills, red eyes, and feelings of paranoia or anxiety.[22][25][26] Long-term side effects may include addiction, decreased mental ability in those who started regular use as teenagers, and behavioral problems in children whose mothers used cannabis during pregnancy.[22] There is a strong relation between cannabis use and the risk of psychosis,[27] though the cause-and-effect is debated.[28]