Association of nicotine replacement therapy product sales with menthol cigarette sales restriction in Massachusetts.

Background: Massachusetts was the first to implement a state-wide menthol cigarette sales restriction in the USA. Following its implementation in June 2020, evidence showed declines in cigarette sales in Massachusetts; however, changes in nicotine replacement therapy (NRT) product sales are unknown.

Methods: This cohort study analysed NRT products sold by US-based retailers available in 26 states from the Nielsen Retail Scanner Data. Outcomes were state-level 4-week aggregate sales of gum, lozenge and patch NRT products converted into pieces per 1000 adults (aged ≥18 years) who smoke cigarettes based on smoking rates from the Behavioral Risk Factor Surveillance System and corresponding population from the US Census Bureau. We used a difference-in-differences method to compare changes in NRT product sales in Massachusetts before (1 January 2017 to 13 June 2020) and after (14 June 2020 to 4 December 2021) the policy with sales in 25 states.

Results: The analysis included 1664 observations for each NRT product, with 1170 from before and 494 from after the policy change. The 4-week NRT product sales per 1000 adults who smoke cigarettes in Massachusetts compared with the comparison states increased for gums by 643.11 (95% CI 365.33 to 920.89; p<0.001) pieces or 12.9% and for lozenges by 436.97 (95% CI 292.88 to 581.06; p<0.001) pieces or 17.9% but no statistically significant change in patches after implementing the policy.

Conclusion: The increases in sales of gum and lozenge NRT products in Massachusetts after implementing the policy suggest that a nationwide ban on menthol cigarettes can increase NRT product use; therefore, interventions are needed to strengthen cessation support for adults who smoke cigarettes but intend to quit.