In science, it always takes more than just one study to get anything done. I've heard that it is akin to using spitballs to change the direction of an aircraft carrier. Unfortunately, there are a lot (not tons) of studies on the effects of tobacco and pipes and cigars. But, most aren't shared outside of the scientific community.
The problem is always when it is reported or used by the media.
The idea that wine is healthy and can help you live longer is an example. The scientific community doesn't accept this, as the study that was reported did not say this either... but the media used one portion of a study and ran with it.
The amount of water we should drink is another example. A few studies showed that the human body requires such and such amount of water per day to stay alive... and the media ran with it saying everyone should drink tons of water. But, the report said that we get the majority of our water from foods.
Science isn't the thing that is flipping and flopping. It's the way the media reports the information. Science is neutral. Studies differ. This is the nature of science. It's the way these are reported by hacks and people with agendas. The science is not always changing. It is merely the talking heads that flip and flop.
Sure, I didn't read the entirety of the study, nor do I want to track down who paid for it, which doesn't matter. If other studies show differently then if false, it is tossed aside. But, the real issue should be who is reporting it. But, in everything I have ever read, tobacco is bad for us. Sure, I accept that. Having watched and watching members of my family die of cancer, I don't doubt for a minute that tobacco is dangerous. But, so is driving, and breathing in today's environment.
It just strikes a nerve when folks throw up that old 60's Surgeon General's report that pipes and cigars are healthy and good for us. It just sounds like stuff that people said back in the 80's in response to all of that science about cigarettes.
Sodas are dangerous, driving, hang gliding, breathing around internal combustion engines, sugar, alcohol, fast food, etc... I can readily agree that smoking pipes is dangerous... but, I have a problem when someone wants to remove my choices, because they think I cannot make informed decisions. That, is what I will fight tooth and nail.