Studs only snap because they've been over tightened and or the threads are oiled/greased. Wheel studs should always be tightened with a correctly adjusted and correctly used torque wrench (it's amazing how many people are clueless of how to use a torque wrench), and must always be fitted dry of any lubrication.
It is possible to fit new studs, but they are pressed in from the back of the hub. This can be a pain as often there's insufficient room behind the hub to get the new stud in place. Fronts aren't too bad, but the rears can be a pain to do.
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