Persistent redness of the throat can be due to ongoing irritation, and chewing tobacco is a common cause, because it damages the lining over time. Stopping tobacco use is the most important step to allow healing and prevent further harm. Keep your throat hydrated with warm fluids and avoid spicy or very hot foods that can worsen irritation. Maintain good oral hygiene and try not to clear your throat repeatedly. Consult your doctor for a proper check if the redness persists.