Was there ever any sustained science that claimed smoking was harmless? AFAIU, smoking was considered by the general population as not good for you health since

Was there ever any sustained science that claimed smoking was harmless? AFAIU, smoking was considered by the general population as not good for you health since at least the early 20th century, and before then as at least a vice (as was caffeine!). By mid century there was sustained scientific output showing clear links to cancer, solidifying cigarettes as an acute hazard to your health even if the scope and magnitude of the harms were less than we know today. Tobacco companies and their defenders countered this sentiment using the same tools used today--dissembling, whataboutism, and your basic FUD techniques. You can't look at ads promoting cigarettes and assume most people accepted what they're communicating at face value. Anyhow, almost everybody knows today that, for example, eating too much sugar is bad for you, but the majority of the population still does it. That's how humans behave. Often times people do something because it's bad, taboo, or dangerous. And not everybody centers their lifestyle around good health; some people are just trying to get through the day. Today we still have doctors who smoke, dentists who drink soda, etc, though those particular vices are less popular than they once were. And let's not forget, while cigarette smoking has been in free fall doctors have been happily handing out prescriptions to smoke marijuana, even though inhaling marijuana smoke is at least as harmful as cigarettes (most people smoke it less frequently, but that's beside the point). Just because something is accepted as normal doesn't mean the harms are being outright denied.