Sunlight-cured tobacco, Bastam, Iran Curing and subsequent getting old enable for the slow oxidation and degradation of carotenoids in tobacco leaf. This produces selected compounds within the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes towards the "smoothness" with the smoke. https://broadfar.com/the-benefits-of-switching-to-nusos-heated-tobacco-solutions/