N.C. Gen. Stat. § 106-568.22

If in such referendum two-thirds or more of the eligible tobacco farmers voting therein shall vote in the affirmative and in favor of the levying or collection of such assessment to be determined by the board of directors of Tobacco Associates, Incorporated, but in an amount of not more than four dollars ($4.00) per acre per year on all flue-cured tobacco acreage in the State of North Carolina, then such assessment shall be collected in the manner hereinafter provided.