N.C. Gen. Stat. § 106-568.46

Upon receipt of a petition signed by at least ten percent (10%) of the tobacco growers in North Carolina known to the Association, the Department shall notify the Association, and the Association shall, within six months, conduct a referendum upon the question of continuing the assessment. If a majority of the votes cast in the referendum are against continuing the assessment, or if the Association fails to conduct a referendum within the six-month period, the assessment expires at the end of the six-month period. If a majority of the votes cast in the referendum are in favor of continuing the assessment, then no subsequent referendum shall be held for at least three years.