It's do able.
Admittedly its harder with player wizards because a lot of players mx their hit points each level and give their mages 16 con so you have to do at least 70 damage in a single hit. But that is where the poison damage comes in.
A high level thief will have a backstab damage modifier of x7 or so, will be using a +3 or +4 weapon at least and will also get his strength damage bonus (if he has 15 or better str)
Normal mages at 30/40 level will have about 50 hit points-the thief will only need to get 7 or 8 or better on his damage (including magical damage) to kill the mage outright.(The mage dies about 50 per cent of the time if the thief has a short sword, about 75 per cent of the time if he's using a bastard sword or a long sword. The percentage is higher if the thief has 15 or better strength)
I tend to dual class fighter mages so they don't die if they get backstabbed incidently, but there are very few mages in BG2 that cannot be backstabbed to death before their contingencies come online.)
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