title: Should ex-smokers avoid beta-carotene?
mesh_terms: D000075202:Contraindications; D019587:Dietary Supplements; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology*; D012907:Smoking / Q000009:adverse effects*; D019207:beta Carotene
chemical_list: D019207:beta Carotene