Sunshine-cured tobacco, Bastam, Iran Curing and subsequent growing old enable for that gradual oxidation and degradation of carotenoids in tobacco leaf. This generates particular compounds during the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes on the "smoothness" of the smoke. https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/