Nothing about drugs there. When the Constitution was written and ratified, the people who did that understood wars to be declared and fought among nations, not inanimate objects.
Nothing about fissile material in there either. It is self evident by the context. If we have the right and duty under our constitution to prevent the smuggling of fissile material into our nation, then we likewise have the right to prevent the smuggling of any other material which may be used to kill or injure Americans.
Do we have the right and duty to prevent people from smuggling fissile material? Or Biological Weapons? Or Nerve Agents?