This claim is misleading because there is no scientific evidence that the Sundarbans mangrove forest produces any mystical vapor with healing properties. 

Mangrove forests, including the Sundarbans, are renowned for their critical ecological roles: they filter water, stabilize coastlines, and provide vital habitats for diverse species. 

While these functions contribute to environmental health and support local communities, they do not involve the emission of any magical mist that cures diseases. 

The idea of a healing vapor likely stems from local folklore and cultural narratives that romanticize the natural benefits of mangroves. In reality, the benefits of the Sundarbans are ecological and tangible—such as erosion control and biodiversity support—rather than supernatural. 

It is important to appreciate the true, science-based contributions of mangrove forests without conflating them with mythological embellishments.