Which of the following statements about nitric oxide is INCORRECT?

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It controls the tone of blood vesselsIts mechanism of action involves cAMPIt is found in tobacco smokeIt plays a key role in achieving penile erectionNone of the above

Explanation

Nitric oxide regulates vascular tone, is present in cigarette smoke, and is crucial for penile erection. However, its signaling primarily occurs through cyclic GMP (cGMP), not cyclic AMP (cAMP). Therefore, the statement that it acts via cAMP is incorrect.