Sun-cured tobacco, Bastam, Iran Curing and subsequent getting older let for your gradual oxidation and degradation of carotenoids in tobacco leaf. This generates selected compounds from the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes towards the "smoothness" of your smoke. https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/