Any information that explicitly says stormtroopers have non-cloned humans amongst its ranks has come from sources post 2002, at the earliest. That's all I'm asking you to agree with me on.
By the same token any info on them being non-regular-humans is from post-2002.
If we're going to make assumptions based on
only information from pre-Attack of the Clones, then there is no reason to doubt they are human (or at least some are). There is no evidence to the contrary. All other officers/workers in the Empire are shown as humans, and Luke and Han are able to wear the armour. They each have unique, individual voices in the scenes they are shown talking (Tatooine + Death Star).
If we're including information from after 2002 then I grant that it opens up the possibility that they are clones, or some are clones, or some used to be clones. However, that has to be weighed against the evidence provided in the OT that they are not. And as I said before, it's very important to note that Lucas did not attempt to go back and re-edit the lines to make them sound like clones, while he did exactly that for Boba's lines. Lucas edits every little thing, and the omission is strong proof that they are not clones.
A final thought: Luke wanted to go to the academy, yet we don't know what it is. Maybe it was a trooper academy, but more likely it was a pilot academy since they showed he was interested in that (and Biggs had gone there and was a pilot). Here's the thing: all the fighter pilots in the PT were clones as well. So why aren't they in the OT? So if the pilots are no longer clones, they it stands to reason that the troopers aren't as well. Also, they changed the name from Clone Troopers to Storm Troopers.
Anyway, can you please stop talking about this in this thread? Take it to the Star Wars community thread or something. I'm not trying to back-seat mod, but it's derailing this trailer thread. Heck, take it to the Unpopular Star Wars Opinions thread.
