Burning agarbatti (incense), dhoop and conducting vedic havans (sacrificial fire rituals) has been practiced in Bharat since thousands of years. These practices are known to create an ideal environment for worship, cleanse subtler energies, attract positive energies and repel negative one's. In fact, not just in Bharat but throughout the world in ancient cultures herbal smoke has been an important part of worship as well as medicine. However, it is in the current century that modern research has been able to understand the scientific basis of such practices. Without going into its metaphysical & spiritual aspects, here we will discuss the physical benefits of lighting incense, dhoop and conducting havans.