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