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