Scientists have heard that correlation is not causation too. From the paper (https://jamanetwork.com/journals/jamaneurology/fullarticle/2805037 https://jamanet

Scientists have heard that correlation is not causation too. From the paper (https://jamanetwork.com/journals/jamaneurology/fullarticle/2805037 https://jamanetwork.com/journals/jamaneurology/fullarticle/2...): > To control for potential confounding, we included age, sex, race (Black, White, other), and ethnicity (Hispanic, non-Hispanic) in all models. We also tested models that included rank (officer, enlisted) and smoking status (ever, never), though smoking status was unknown for a substantial proportion of the cohort. We repeated analyses in subgroups defined by sex and by race and ethnicity. We conducted several analyses to explore possible biased ascertainment of PD in Camp Lejeune veterans due to potential awareness of the contamination and presumptive service connection that entitles them to VA benefits. … > We additionally tested associations in men and women separately and conducted sensitivity analyses that adjusted for total number of years of VHA health care usage. These analyses were evidently deemed adequate by peer reviewers. If anyone thinks there are other confounding factors they can go ahead and do that analysis and publish as well. Sciencing continues.