Nicotine is a vasoconstrictor, meaning it will cause your peripheral blood vessels to constrict and press more blood into the core area of your body, increasing bloodpressure in the process. Also, oxygenation of your blood is impared via the toxins that the lungs are receiving, (so heart rate increases via the increased CO2 receptors and a few more other complex things happen). The main reason for the weakness and faint-like feeling should be low oxygen levels in your brain. It sounds as though you're are a beginning smoker and your body hasn't adapted to the toxins as much yet as to ignore the assault....
The strange thing is blood prefers to carry carbon monoxide vs. oxygen so, smoking is going to reduce the level of oxygen in your system right from the start. This can cause a person to have a light headed sensation. It may be something to discuss with your doctor at your next visit.
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