Hash oil is the most powerful form of cannabis. The effects of cannabis are somewhat unpredictable. The drug's typical effect is to make the user feel relaxed and less inhibited. Some users laugh a lot, others become quiet and withdrawn or sleepy. Cannabis causes increased appetite and bloodshot eyes and can affect sensory perception.
Cannabis can also cause poor coordination, a reduced attention span and short term memory loss.
Users may lose track of their thoughts or of conversation. Heavier doses can cause confusion, excitement or anxiety. Users may have hallucinations. The effects of cannabis on coordination make it a factor in road accidents. Some heavy users lose energy and motivation and experience a deterioration in memory, concentration and ability to learn new things.