Short attention span. Unable to divide attention well. Impaired perception of time and distance. Can cause disorientation and dizziness Excessive use can lead to paranoia and psychosis . Mood swings and sharp personality changes.
Cannabis is used mainly as a social drug.
Users of cannabis generally feel the effects 8-9 seconds after inhaling the smoke. 3-6 hours later the user will feel normal again. Cannabis is not addictive in the usual sense, but people have been know to having trouble controlling it's use. Tolerance to the drug and physical withdrawal symptoms are claimed not to not occur. Evidence of cannabis can be detected in some blood and urine tests long after the substance has been used.