Maryland Code, Commercial Law § 11-504

(a) A retailer or wholesaler with intent to injure a competitor or to destroy or substantially lessen competition may not make a retail sale of cigarettes or a wholesale sale of cigarettes at less than the cost to the retailer or the cost to the wholesaler, respectively.

(b) A retailer may not purchase cigarettes from a wholesaler at a cost which directly or indirectly is less than the cost to the wholesaler by any means, including offering, accepting, inducing, or attempting to induce a rebate in price or a concession of any kind in connection with the sale or purchase of cigarettes.