Sun-cured tobacco, Bastam, Iran Curing and subsequent growing old make it possible for to the slow oxidation and degradation of carotenoids in tobacco leaf. This creates certain compounds from the tobacco leaves and offers a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes into the "smoothness" https://nmate35791.wikilinksnews.com/5941908/an_unbiased_view_of_smoke