Guns and marijuana don’t mix, according to federal authorities, even if the gun is a legally held firearm and the drug is recommended by a doctor.  That interpretation of federal law is turning up in Illinois’ draft medical marijuana regulations to the frustration of patients and caregivers.  Gun ownership is overshadowing other issues as the state launches its first medical cannabis program.  Some patients say they will continue to use marijuana illegally rather than give up their guns.  The dispute centers on 93 words out of 48 pages of rules proposed by the Illinois Department of Public Health.  The wording, in effect, advises gun owners they’ll be in violation of state and federal law if they’re approved for a medical marijuana card and don’t give up their firearms.