Sunlight-cured tobacco, Bastam, Iran Curing and subsequent getting old make it possible for for that gradual oxidation and degradation of carotenoids in tobacco leaf. This provides specific compounds during the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes on the "smoothness" https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/