I just looked up lobelia on the internet as I've never heard of it before. According to what I'm reading it was smoked by American Indians for treatment of asthma. It's also used, in other forms, for all sorts of respiratory ailments. The jury is out on the safety of it, though it's considered okay in small doses. It also has the nickname of "puke weed" as it was once used to induce vomiting in order to remove toxins from the body.
Would you say a pure drop of Mediterranean oregano is hotter or a drop of pure cayenne?