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