Full text: Available Index: IMSEAR (South-East Asia) Main subject: Plants, Toxic / Respiration / Respiratory Function Tests / Time Factors / Nicotiana / Humans / Male / Smoking / Follow-Up Studies / Circadian Rhythm Type of study: Observational study / Prognostic study Country/Region as subject: Asia Language: English Journal: Indian J Physiol Pharmacol Year: 1970 Type: Article