One thing that matters is that cigars (and some other tobacco products e.g. snuff) generally cause mouth and throat cancer instead of lung cancer, because they

One thing that matters is that cigars (and some other tobacco products e.g. snuff) generally cause mouth and throat cancer instead of lung cancer, because they are used differently. So it's worth verifying what exactly the studies compare, as a result about a difference in lung cancer does not imply an equivalent difference in cancer as such.