Solar-cured tobacco, Bastam, Iran Curing and subsequent getting old let to the gradual oxidation and degradation of carotenoids in tobacco leaf. This makes particular compounds while in the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes to the "smoothness" with the https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/