This is a quick summary of how nicotine will affect your fitness level.
When you inhale smoke into your lungs, your heart has to work harder. You can see this by monitoring the pulse of a smoker after they puff on a cigarette. The heart actually beats faster and harder. It then becomes more difficult to breathe.
Your arteries constrict and cause a build up of pressure in them, thus causing higher blood pressure. These effects also occur in the arteries of the heart, causing less blood flow to the heart muscles. The oxygen in your lungs decreases taking away the available oxygen for your working muscles and reducing your endurance tremendously.
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