Gifford Pinchot National Forest fire managers have issued restrictions on campfires, smoking, and other activities within the forest starting today.  Prohibitions include building, maintaining, attending, or using a fire, campfire, or stove fire, including a charcoal fire and pellet fire on all Gifford Pinchot general forest land and developed campgrounds.  Smoking is prohibited, except within an enclosed vehicle or building, a designated campground, or while stopped in an area at least three feet in diameter that is barren or cleared of all flammable material.           Also banned is possessing, discharging, or using any kind of firework or other pyrotechnic device, and operating or using any internal or external combustion engine without a spark arresting device properly installed, maintained, and in effective working order.  Portable cooking stoves, lanterns, and heating devices using liquefied or bottled fuel, such as propane, are still allowed as they can be instantly switched off.