I don't know about 1m. I fucked my self up trying to do a double front of a 15ft drop. I landed right on my back and got a gnarly bruise that swelled up and wind knocked out of me and called it a day. There is this 30ft block on a lake near my house and people have dislocated shoulders and stuff from landing wrong nothing more serious than that though.
Fucking up on anything over 50 feet sounds like it has the potential to be bad.