In this way, barcoding and handling issues are addressed, while a cigars wrapper leaf is still visible in the retail environment
regulators said they have identified more than a dozen large retailers and gas-station brands with high rates of illegal tobacco sales to minors, including locations operated under the Exxon Mobil, Sunoco and BP names, as well as Walmart and Kroger
Although convenience sampling may introduce bias, participants were recruited through both online and in-person channels in academic institutions and community settings, which allowed the inclusion of individuals from different age groups, educational levels, occupations, and residential areas, thereby enhancing sample diversity despite the absence of formal stratification or quotas
Betman & Associates
To further validate, we measured the concentration of nicotine, cotinine and 3-hydroxy-cotinine (OH-cotinine) in the exposed wells using mass spectrometry