Does carbon monoxide cause heart disease if you smoke?

A fast heart-rate is actually one of the known symptoms of carbon monoxide poisoning.

The chemistry of the blood allows the release of chemicals signalling the heart to pump faster when the concentration of oxygen in the blood drops. Carbon monoxide ties up hemoglobin - which causes the oxygen concentration in the blood to drop - and thus the blood chemistry signals the heart to beat faster to compensate. If the air the person is breathing is loaded with carbon monoxide, this only makes matters worse since it speeds up the saturation of the hemoglobin with carbon monoxide instead of oxygen.