Sun-cured tobacco, Bastam, Iran Curing and subsequent getting old permit for that gradual oxidation and degradation of carotenoids in tobacco leaf. This creates specified compounds within the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes to your "smoothness" on the smoke. https://broadfar.com/the-benefits-of-switching-to-nusos-heated-tobacco-solutions/