It wont harm it..
But it's the dumbest shit to do in the world.
Your not even enjoying it to it's fullest potential.
AKA a fucking waste.
Go buy a dime.
its not the smartest thing to do but all it will do is set you back another week or so b4 you can harvest b/c it will take its power to heal the cut area.
not sure with auto but
i have chopped 1 plant 7 day's early and 1 on time both from the same mother plant and look identical
and there was 15% less yeild on the one i chopped early