Rana
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Some possessing spirits can only be driven away with dispels. Powerful druids and most other powerful spellcasters can dispel. You? Cannot. Given that the spirit requires some sort of life to feed on, they are likely to seek out another host at once. And given that many of them seem to have a twisted sense of vengeance, the host they are likely to choose is the caster performing the exorcism.

Some are stickier, and cannot be driven away. But death of the host will generally deal with them swiftly. Preferably, this would be done from range, so that the spirit cannot reach someone else swiftly enough to possess them.

Spirits, as a general rule, aren't supposed to exist.