A question to ponder?

Had a bunch of construction guys working in my yard laying new water and sewer lines up and down the block. Everyone of them was a smoker. Alot of the neighbors were out watching them dig and do there work. A couple of them asked me what happened when they saw my neck scar. I smoked
very little compared to most. I honestly smoked about 5 to 6 cig's per day. I see most smokers who light up one right after the other. I want to tell them not to so they don't get what I got. I also have some good friends who continue to smoke
after seeing what i am going thru. It offends me that good friends of mine continue to smoke after seeing what it did and is doing to me. Am i off base in voicing my opinion to current smokers?
Any opinions?