What type of study involves a group of patients trying to quit smoking with the same medication and weekly sessions?

The correct answer describes a cohort study. In a cohort study, a defined group of individuals (in this case, patients trying to quit smoking) is followed over time to assess outcomes related to certain interventions or exposures—in this scenario, the use of the same medication and participation in weekly sessions aimed at smoking cessation.

This type of study allows researchers to observe the effects of the intervention on smoking cessation rates within the group, providing insights over the course of the treatment. Participants are typically observed for a prolonged period, which facilitates the monitoring of their progress and helps establish any causal relationships between the intervention and outcomes.

Other study types do not align as closely with the specifics of this scenario. For example, a case-control study would involve comparing individuals with a specific outcome (like successful smoking cessation) to those without it to identify potential risk factors, which is not the focus here. A cross-sectional study assesses data at a single point in time and does not involve following participants over time. A randomized controlled trial involves randomly assigning participants to different intervention groups to compare outcomes, which is not indicated in the question. In this case, since the patients are all receiving the same treatment rather than being randomly assigned to different treatments, it more accurately reflects a cohort study.