Sunshine-cured tobacco, Bastam, Iran Curing and subsequent ageing allow for to the slow oxidation and degradation of carotenoids in tobacco leaf. This provides certain compounds within the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic flavor that contributes into the "smoothness" of your smoke. https://directorypixels.com/listings13142280/the-5-second-trick-for-smoke