Instruct: Classify Amazon reviews into positive or negative sentiment
Query: toxic

We put these imitation filters in our humidifier, and it instantly stunk up the room with a toxic smell. It was pungent and disgusting, making these filters completely unusable. Honestly, these filters should be tested for safety. I really think that they may be toxic. Avoid!I replaced them with the only slightly more expensive Vornado filters. Smell was gone.