Solar-cured tobacco, Bastam, Iran Curing and subsequent growing old permit for your slow oxidation and degradation of carotenoids in tobacco leaf. This produces specific compounds in the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes into the "smoothness" in the smoke. https://broadfar.com/heated-tobacco-shaping-a-safer-sustainable-smoking-future/