Sun-cured tobacco, Bastam, Iran Curing and subsequent growing old enable for your slow oxidation and degradation of carotenoids in tobacco leaf. This produces selected compounds from the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes to the "smoothness" on the smoke. https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/