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