Relying on a Non-Religious Seller for Kosher Certification

I bought a kosher for Passover refill for an electronic cigarette. The seller in the store added ice, meaning a substance that gives a cooling sensation. On the box, it was handwritten 'kosher for Passover,' and the seller also said it was kosher for Passover. The question is, can I rely on the seller if he is not religious?

Hello,

Someone who does not observe mitzvot and kashrut is not reliable regarding kosher certification.

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