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