The REACT (Researching Equity-Advancing Counter Tobacco Policies on Flavors) study is an online study exploring the impact of tobacco product advertising and policies on youth and young adults. Specifically, the REACT study aims to assess the impact of local flavor policies on flavored tobacco use across communities, observe how comprehensive policies affect exposure to tobacco marketing and use, and examine the equity implications of local flavored tobacco product policies on racial/ethnic minoritized youth and young adults and those of lower SES.