“…In previous studies, current CS has been associated with nasal discharge and blockage [25], reduced perception of smell [7], and snoring and sleep apnoea [8,26,27], as well as headache [28], coughing [29], and sinusitis and sinus problems [30], although several studies have not been able to identify similar associations [10][11][12][13]15]. A doseresponse like relationship between CS and upper respiratory conditions such as rhinitis, impaired olfaction, and sleep disturbances has also been described [26,31,32].…”