Acharya Prashant clarifies that the Shrimad Bhagavad Gita does not support the concept of the transmigration of the soul. He explains that the term used in the relevant verses is 'Dehi', referring to the individual entity or 'Jivatma', rather than the 'Atma' itself. The soul does not enter or exit a body, and there is no mystical light or smoke that leaves at the time of death. The increase in human population from one billion to eight billion is a phenomenon of nature, which expands and contracts like the waves of an ocean, creating and dissolving life forms based on natural conditions, much like insects appearing after rain.