wouldn’t fancy breathing in resin/carbon for a living.
Without digging out the paperwork, I’m going to stick my neck out and say it’s not that bad. At the extreme end in commercial boat building on a production line you’ve got spray-up (as opposed to lay-up) where the chopped strands are mixed with resin and catalyst and fired out of a spray gun into the mold.
Chopping pre-preg mat is about as safe as you’re going to get, there’s no dust and the resin isn’t particularly volatile.
The most obvious ‘danger’ is sensitivity to the resins, which isn’t life threatening but after prolonged exposure you become allergic to them and develop eczema type symptoms, after which you can no longer work with it. Prevention from that is gloves, long sleeves etc.