Modifies provisions relating to indoor air quality

HB 926 modifies Missouri's Clean Indoor Air Act by establishing new definitions to clarify where smoking and vaping are prohibited. It specifically defines terms like "cigar-tobacco bar" (requiring over 50% revenue from tobacco sales to qualify for exemptions), "electronic smoking device" (excluding medical inhalers), and "enclosed area" to determine coverage. The bill directly affects businesses (bars, restaurants, health facilities), public buildings, and workplaces by defining where smoke-free rules apply. Key provisions include exemptions for certain tobacco-focused venues based on revenue verification and clear boundaries for "entryways" and "indoor areas." This bill refines enforcement language rather than introducing new prohibitions.