Coltsfoot (Tussilago farfara).

full of flavinoids Galen and Dioscorides insist you smoke the leaves for any chest complaint. One of the best pulmonary herbs then and now. A high dose should not be used for too long because of alkaloids alongside the rutin, hyperoside and isoquercitins.The plant is the major constituent of British Herbal Tobacco , which is used for pulmonary problems without the risks of tar and nicotine.The ancients tended to favour burning the herb for a smoke inhalant rather than as a cigarette.

dont confuse with dandelion-coltsfoot is smaller and "scruffier" or butterbur as that is full of alkaloids, (leaf growth is much greater in butterbur).