bath salts
US /bæθ sɔːlts/
UK /bæθ sɔːlts/

1.
crystalline substances added to bathwater to enhance the bathing experience with fragrance, color, and therapeutic properties
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She added lavender bath salts to her warm bath for a relaxing evening.
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The store has a wide selection of scented bath salts.
2.
a common street name for synthetic cathinones, a class of designer drugs with stimulant effects
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Authorities issued a warning about the dangers of using illicit bath salts.
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The substance known as 'bath salts' can cause severe hallucinations and paranoia.