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