OKLAHOMA CITY — Pot advocates celebrated the culmination of a yearslong effort to ease restrictions on the use of cannabis last month when nearly 60 percent of Oklahoma voters approved medical marijuana.Oklahoma’s proponents had even included a two-month deadline for the implementation in their measure so as to avoid the years of delays they had seen elsewhere.But that has not stopped state health officials and the Republican governor from making drastic changes. Within weeks of the election, they signed off on …