Sunlight-cured tobacco, Bastam, Iran Curing and subsequent growing older permit for the slow oxidation and degradation of carotenoids in tobacco leaf. This makes certain compounds in the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic taste that contributes on the "smoothness" with the smoke. https://broadfar.com/heated-tobacco-shaping-a-safer-sustainable-smoking-future/