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