Sunlight-cured tobacco, Bastam, Iran Curing and subsequent getting old enable with the slow oxidation and degradation of carotenoids in tobacco leaf. This provides specific compounds inside the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes into the "smoothness" in the smoke. https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/