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In page Kalmia polifolia:

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According to Alaback et al., Kalmia polifolia contains a grayanotoxin, which when ingested lowers blood pressure, and may cause respiratory problems, dizziness, vomiting, or diarrhea.[3] According to Lewis and Elvin-Lewis, the active compounds within Kalmia polifolia include andromedotoxin and arbutin. These compounds cause a slowing of pulse, a lowering of blood pressure, progressive paralysis and death.[4] Kalmia polifolia has poisoned cattle, goats and sheep. For poisoning to occur, the animal must consume 0.3% of its body weight, while a dosage of 2% of an[vague] would cause severe sickness.[1]