Ceramic fiber products can potentially cause allergies or health problems, particularly for individuals with sensitivities or in specific exposure conditions. These fibers, when inhaled, may lead to respiratory issues, such as irritation or more severe conditions like fibrosis in the lungs over time. People with pre-existing respiratory conditions may be at a higher risk. Additionally, exposure to certain types of ceramic fibers classified as carcinogenic can pose a risk of lung cancer. It's important to handle ceramic fiber products with care, using appropriate protective equipment, and to ensure proper ventilation in areas where these materials are used or processed.