Solar-cured tobacco, Bastam, Iran Curing and subsequent aging allow for with the sluggish oxidation and degradation of carotenoids in tobacco leaf. This creates particular compounds in the tobacco leaves and provides a sweet hay, tea, rose oil, or fruity aromatic taste that contributes for the "smoothness" from the smoke. https://finnpdqbo.wikikarts.com/1397423/smoke_for_dummies