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