It's a normative belief in Hareidi Judaism, and Hasidim are especially enthusiastic about it. You will be regarded as a heretic if you say it's nonsense. Outside the Hareidi community attitudes are varied, running the gamut from full acceptance (followers of Rabbi Kook) to ambivalence (Modern Orthodoxy) to seething about how it's ruined Judaism (a handful of retarded Ashkenazim larping as Yemenites).
Incidentally, the things people will fall for in the name of Kabbalah are pretty funny. A lot of it is just traditional European/Arab superstition and folk beliefs dressed up as secret esoteric knowledge, but some of it is more exotic, like magic anti-masturbation rings:
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