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