I think you have to take the 1964 report with a grain of salt. After all, this report is 50 years old! I'm not saying that some of the data from the report isn't relevant, but like everything in the medical and scientific fields, advances in technology and continued research and new data often provides updated results and new conclusions. I think today if you were to try and cite the 1964 report as a justification for the benefits of pipe smoking you could open yourself up for criticism by those who will argue that the report is "outdated".
That said, I think we have to be careful what you wish for if we look towards the hope of obtaining new updated research on the effects (positive or negative) on pipe smoking. In a perfect world we would like to think that researchers are impartial and will report their findings free of any bias, but unfortunately, most researchers do bring a level of bias into their research. First of all, research studies cost money and often times the entities or organizations that sponsor these studies do so because they have a vested interest in the research. If the CDC or the American Cancer Institute, for example, were to sponsor such a study, odds are that the study will be weighted towards anti-smoking. Also, if a researcher starts out with an anti-tobacco bias, the chances are that this bias will impact his/her findings.
In the end, I think we're left with the fact that there probably are some legitimate concerns regarding lip, throat and tongue cancers, but there is probably also a legitimate argument to be made that pipe smoking does offer some benefits such as reducing stress. I'm a firm believer in everything in moderation whether it be with what you eat, drink, or smoke. As informed adults, we make our own choices and if pipe smoking brings enjoyment to you, then by all means enjoy your tobacco.
