Consumer demand for nicotine products has fluctuated due to inflation and rising cigarette prices over the past 13-19 months. However, the Neilsen report covering the four-week period ending Dec. 30 shows that market shares are holding steady for both next-generation and traditional tobacco brands. The market share of R.J. Reynolds’ top-selling Vuse e-cigarette remained flat at 42 percent in December at convenience stores, according to the report. While Vuse’s market share was unchanged, No. 2 Juul dropped from 24.3 percent to 24.2 percent for the report covering the four-week period ending Dec. 30.