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