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