From Jude's Herbal Home Remedies by Jude C. Williams, M.H., pg. Let steep for several hours, then strain. After shampooing hair, use the tobacco tea as a rinse. The hair should be rinsed at least 15 times with the tea, so do this over a bowl or plastic basin to catch it. Comb hair directly after rinsing and leave the tea in for shampooing for several hours before shampooing out.
Seeds are toxic if taken internally.
Leaves may cause a rash. From the The Complete Medicinal Herbal by Penelope Ody, pp. Repeat use daily. Apple cider vinegar will help loosen the eggs by dissolving the glue that holds them to the hair shafts. Use it as a rinse after shampooing.