Sunshine-cured tobacco, Bastam, Iran Curing and subsequent aging allow for to the slow oxidation and degradation of carotenoids in tobacco leaf. This creates specified compounds in the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes on the "smoothness" on the smoke. https://broadfar.com/the-benefits-of-switching-to-nusos-heated-tobacco-solutions/