Important to be aware that the study often used saying "we have newer, better studies than the 64 SG report" actually had similar findings, but was agenda driven.

Association Between Exclusive Pipe Smoking and Mortality From Cancer and Other Diseases

excerpt: "Comprehensively documenting the deleterious health effects of pipe smoking is important in countering efforts by the tobacco industry to promote pipes as a desirable alternative to cigarettes or cigars. "

The finding was more of less the same-- moderate, non inhaling pipe smokers have very little health risks (often within the range of being statistically insignificant), especially ones who don't drink alcohol excessively either.

They got some of their desired results by lumping all the groups they controlled for together, averaging everything out. So they say nebulously that "pipe smoking" increases risks for X by 200% for example, they are averaging everyone-- those who smoke one bowl per day, and those who smoke 11+, inhaled deeply, and drink excessively. Very sloppy, but for their agenda it was necessary (and probably their funding also).