It is. Gigantheums are just a strain of opium poppy with very large heads. Seeds can be used to make tea containing opium, but it takes a shitload and tastes horrible. Poppy pods are far better, 100 pods large pods, when ground to a fine powder in a blender, will give about about a gallon of powder, plus about a quart of seeds. A couple shot glasses of the powder, made into a tea, is about equal to a strong opiate pill, or several hydrocodones. You could evaporate the water off to give smokable opium.