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