Sunlight-cured tobacco, Bastam, Iran Curing and subsequent getting older let for that slow oxidation and degradation of carotenoids in tobacco leaf. This creates particular compounds inside the tobacco leaves and gives a sweet hay, tea, rose oil, or fruity aromatic taste that contributes to your "smoothness" of your smoke. https://icelisting.com/story20113466/cigarettes-no-further-a-mystery