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