Sunshine-cured tobacco, Bastam, Iran Curing and subsequent getting old permit with the gradual oxidation and degradation of carotenoids in tobacco leaf. This produces certain compounds inside the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic taste that contributes into the "smoothness" with the smoke. https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/