You lose no weight. If theoretically your plant gets everything it needs and you have skills, the plant will simply redistribute whatever weight would have been produced on that cola Minus what was already produced and including a lag period for regeneration. Let's say the stick that broke off had 5% bud weight because it wasn't filled out yet; you lose that 5%. The remaining 95% potential bud would then magically appear on fatter tertiary colas. Likewise, if you were to trim all that crap popcorn bud on the lower 1/3 of the plant, whatever energy would have went to those crappy flowers would be redistributed upward to the colas you WANT fattened.
Ah, pruning a weed. Isn't it wonderful? Thing about how hedges work. You mow em down into a block or sphere with a jagged saw only to have them grow back wily and crazy within a month.