Sunlight-cured tobacco, Bastam, Iran Curing and subsequent getting old let for your gradual oxidation and degradation of carotenoids in tobacco leaf. This creates sure compounds within the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes on the "smoothness" of the smoke. https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/