Snoring is a warning sign separate from sleep apnea:

The researchers looked at the carotid arteries in snorers and found increased thickening of the artery walls, indicating damage already setting in. The researchers suggested that the damage could be due to the trauma and inflammation caused by the vibrations of snoring. However, previous research on the connection between sleep apnea and artery disease has found a reverse connection –  the arterial damage comes first, lowering the amount of oxygen in the blood, leading to breathing interruptions. It could be that thickening of the arteries is contributing to the snoring as well, not just the other way around.