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Lobelia at a Glance
Lobelia inflata, commonly called lobelia, Indian tobacco or puke weed, is an annual or biennial member of the Campanulaceae family native across much of eastern Canada and the north-central and eastern United States. Its small pale flowers are followed by characteristically inflated seed capsules.
Parts & Chemistry
Historical herbal use centers on the aerial herb. Lobelia contains a group of piperidine alkaloids, the best known of which is lobeline. Lobeline interacts with nicotinic acetylcholine systems and has been investigated for effects related to nicotine and other stimulants.
Traditional Use
Lobelia has a long history in North American herbal practice. Older sources describe it as an emetic, expectorant, antispasmodic and respiratory stimulant, and it became especially associated with cough, difficult breathing and other respiratory complaints. Its strong tendency to provoke nausea and vomiting also explains the old common name “puke weed.” Traditional use does not establish that it is safe or effective for modern treatment of asthma or other breathing disorders.
Research
Modern research has focused more on lobeline than on whole-herb preparations. Lobeline was once marketed for smoking cessation because of its nicotine-like pharmacology, but a Cochrane review found no adequate long-term evidence that it helps people quit smoking, and the National Center for Complementary and Integrative Health states that there is no current evidence that lobeline supplements are effective for smoking cessation. Memorial Sloan Kettering likewise notes that human evidence for asthma and smoking cessation is lacking or unsupportive.
Preparation & Home Use
Because the difference between a pharmacologically active exposure and an adverse exposure can be narrow, this article does not provide a home dose, tea recipe or tincture formula. Lobelia should not be approached like a routine culinary herb. Historical preparations belong in the context of trained herbal practice and modern safety review.
Safety
Lobelia can cause dizziness, nausea, vomiting and throat irritation, and larger exposures to lobeline-containing material may affect heart rate, blood pressure, the nervous system and breathing. Serious toxicity described in medical references includes weakness, tremor, seizures, respiratory depression and coma. Avoid combining lobelia with nicotine-containing products because their effects may be additive. Pregnancy and breastfeeding are additional reasons to avoid unsupervised use. Anyone with significant breathing difficulty should seek appropriate medical care rather than relying on lobelia as a rescue treatment.
Botanical & Historical Notes
The name Indian tobacco reflects both the plant's historical smoking-related associations and its resemblance in use—not botanical relationship—to tobacco. It is a native North American wild plant found in fields, open woods, roadsides and disturbed habitats. The inflated fruit capsule is one of its easiest identifying features.
Bottom Line
Lobelia inflata is an important historical North American respiratory herb and a source of the pharmacologically active alkaloid lobeline. Its traditional reputation is substantial, but modern clinical evidence does not support smoking-cessation claims, human evidence for asthma is lacking, and adverse effects can be significant. It belongs in a safety-conscious educational herb library, not in casual self-dosing. For educational purposes only.