Solar-cured tobacco, Bastam, Iran Curing and subsequent getting old enable for the slow oxidation and degradation of carotenoids in tobacco leaf. This provides sure compounds during the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic taste that contributes to your "smoothness" from the smoke. https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/