Every single cigarette/cigar contains over 4000 toxic carcinogens that have a negative impact on virtually every system of your body.  They can cause cancer in the mouth, larynx, stomach, lungs, pancreas, liver and spleen not to mention others.  They create acidosis and raise blood pressure.  Tar build up leads to respiratory issues and emphysema.  Sounds like fun, right?  1 pack per day increases your risk of heart attack by over 10x a non smoker.  February is heart health month.  Do yours a favor and quit today.  Pass this (including image) on to anyone you know who smokes.  Remind them that their spouses, kids, dogs, etc are depending on them.  The left side is a healthy pair of lungs, and the right is smokers lungs.  Do the math and take this to heart.