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