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There are a number of concerns about the potentially deleterious effects of cannabis use on patients with ischaemic heart disease , hypertension , and cerebrovascular disease ( Jones , 1984 ; National Academy of Science , 1982 ) . In the earlier of the two ( Jones , 1952 , p209 ) , the " far-reaching effects in the life of the community " of the city 's religious divide were stressed , especially in relation to residential segregation . Others disagree that the correct stance could be so universal and claim instead that it is relative to climate , as well as to other factors listed above , such as domain ( Jones 1999 ) . Likewise , book-length studies on kinship diplomacy have sprung up in recent years , including epigraphical analyses of kinship terms and a general survey of kinship diplomacy ( Jones 1999 ) . It has been radiocarbon accelerator-dated to the Neolithic with almost identical dates on associated cereal grains and charcoal ( Jones and Legge 1987 , 454 ) , so there is no doubt about its provenance .