terribly bad i heard one cigarette takes one second off your life its not much but it adds up to days weeks maybe years and long term smoking will cause bad stuff to example emphysema you want know what its like get an ordinary straw run and only breathe through the straw with your mouth
It is really bad. Depending on how much they smoke. If they smoke 1/2 to 1 whole pack a day it can kill them 15 years earlier then when they would have died. It weakens your lungs so you can't breathe as well, which could cause lung cancer, It also makes you smell really bad.