agree with this having a negative effect on the ket, but for me when I combo this I'm not taking ket to hole, I'm taking GABA and the ket adds additional sedation and dream like quality to the buzz.
totally get why you would add it in, just got to be careful on which benzo and that preg is gonna potentiate sedation + ket = CNS risk.
this is 1 of my bender combinations on a day session, preg + diazepam as a starter, sprinkle in some stim in at some point, a little bit of ket later for flavour, then wind by drizzling on a few beers, and then another benzo or soma for desert, freshly grated cannabis to taste through the day, yummy
But would agree, ket on it's own is amazing, this stuff will ruin the ket if that's what you're looking for