Solar-cured tobacco, Bastam, Iran Curing and subsequent aging permit for the gradual oxidation and degradation of carotenoids in tobacco leaf. This produces particular compounds while in the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes on the "smoothness" on the smoke. https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/