It is no doubt that you see a lot of people who smoke on a daily basis and sometimes when you aren't even a smoker, you decide to chill and hang out with them.
Let me give you this breaking news that even when you are not smoking but are exposed to secondhand smoking fume you are liable to certain health problems which could include coronary heart disease , lung cancer , stroke as a result of thrombosis which could reduce the amount of blood and oxygen being carried to the brain , low birth weight , and in children , it can lead to an asthma attack in the infants and other respiratory infections, and Sudden death syndrome. This is what you get for smoking (although you might have them and worse), this is what you get for sitting with someone who smokes regularly.