Stress: You answered your question. Stop smoking and learn to deal with stress.
Answered 3/20/2013
5.2k views
90 is normal: When you are out and about your body needs more energy, needs more blood flow. The cardiac output is increased by increasing the heart rate. Stimulants: caffeine, nicotine contribute too.
Answered 12/28/2014
5.2k views
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