D E A T H....
Just kidding, here's a list:
initial stimulation, then reduction in activity of brain and nervous system
increased alertness and concentration
feelings of mild euphoria
feelings of relaxation
increased blood pressure and heart rate
decreased blood flow to fingers and toes
decreased skin temperature
bad breath
decreased appetite
dizziness
nausea, abdominal cramps and vomiting
headache
coughing, due to smoke irritation.