sudden death

 suffocation

 visual hallucinations and severe mood swings

 numbness and tingling of the hands and feet

 potential cardiac dangers for those with preexisting heart disease

 headache, muscle weakness, abdominal pain

 decrease or loss of sense of smell

 nausea and nosebleeds

 hepatitis

 violent behavior

 irregular heartbeat

 liver, lung, and kidney impairment

 brain damage

 nervous system damage

 dangerous chemical imbalances in the body

 involuntary passing of urine and feces

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