There's no evidence that getting a concussion means that in the future, you will get another concussion from less acceleration of the head as a result of sudden forces applied to the skull.
The source reads:
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"We used to think that if you took a bunch of little hits, then you were more likely to get a concussion from a smaller impact," Broglio says. "But our findings don't support that."
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Source:
http://www.ns.umich.edu/new/multimed...young-athletes