Actually these possess things more effected the weak personality, as apart from doing all sort of funny things to scare the person the jin tried to control the person by take over his action at times.
If the person is mentally strong then, he would not allow this to happen (thus avoiding worst situation), however it would still effect his personality in subtle ways.
In any case if you recite Manzil the Jin could not come near you, the best you should recite the Manzil in loud voice before bed time, so your whole house would be protected for that night.
Black Magic and Jin are two different issues (it could be combine at times when the person send Jin to make victims life like hell. Otherwise it is common now that Jins are sharing in same house as humans. As long as they are living peacefully and not bothering us we should not try to chase them away.