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