It has been claimed that in large quantities, Lobelia can cause nausea and vomiting.  In small quantities, however, Lobelia can be beneficial. It can act as a replacement for tobacco for those trying to quit cigarettes, as the herb binds to the same pleasure receptors in the brain as nicotine.  The blends that contain Lobelia are the OG Bear Blend, Dream Lodge, Vizion, Mintz, Amazon, Shaman, and Kin Nik Nik.  The amount of Lobelia contained in these blends is less than 1% of the total formula of the blend, and the Lobelia in a tin of Bear Blend is far below a level that could induce nausea.

For more information on the history of Lobelia use and its study as a medicinal herb, this is a good read from world-renowned medical herbalist Paul Bergner.

You can learn more about Lobelia here.