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not good for your lungs.
This. I've known a couple of guys over the years who have developed silicosis and seeing what happened to them scares the shit out of me. A well fitted dust mask is a must when doing this type of work.
The only way I'd do anything like this with an abrasive blade is with a proper wall chaser and dust extraction system but I'm guessing that over a grand for a decent wall chaser and an extra Monkey for an M class dust extractor is a bit spendy for some DIY.
Bobbo
Tomo187
I prefer to cut it with a multitool (usually a messed up blade will do it) then chisel out. That way you don't have to worry so much about the brick dust which is one of the worse for being tiny particles. Not only does it get everywhere, it's abrasive and not good for your lungs. You're still going to get a good taste of it even chiselling. Different types of brick also make a difference to how easy they are to chisel.