Originally Posted by
Always Flyin
All TSA would have to say is that marijuana is an organic substance that can burn, fires are a danger to aircraft, and thus marijuana is dangerous to aircraft.
And so is tobacco, but it is not considered a prohibited item. Neither marijuana nor tobacco is a WEI, so the TSA has no authority to place it on the prohibited list unless it wants to include every combustible on the planet as prohibited (which would include books, newspapers and magazines).