Nicotine is a stimulant found in tobacco which "speeds the heart rate, raises blood pressure, and stimulates brain-wave activity associated with wakefulness, making it harder to fall asleep."
Buka nngwe ya re: "Batho ba ba gogang motsoko ba palelwa ke go thulamela ka gonne motsoko o oketsa kgatelelo ya madi, o dira gore pelo e iteye ka bonako le gore diphetogo tsa boboko tse di diregang fa motho a robetse di nne bofefo thata.