I smoked at a ripe age of 18. I worked with customers all day and all night. During my breaks, I'd sneak out burn a cigarette. It was my safe haven. 12 years later I switched to vaping. So I guess it depends on the person, why they smoke to begin with (or vape now), and what may have pushed them to start smoking.
For me I think it had a lot to do with growing up around smokers. Everyone in my family smoked. My mother smoked, my father smoked, my aunts and uncles smoked, my cousins smoked... so smoking may have been predestined for me? I don't know, I could have chosen not to I guess, but I picked it up and did it anyways.
Then I joined the Marine Corps, I didn't smoke for 13 weeks, and after I graduated from boot camp, I could have stayed cigarette free (hell, I probably should have) because I was in the best shape of my life back then. I picked it up again at my first duty station. So ... where is my story going? I don't know. All I know is vaping and I have had a pretty rocky go around, I love it, but sometimes I'm tempted to grab a cigarette still from time to time. Do I? No, I'd rather not. I wonder how an employer is going to look at me when I rush out to have a vape during my break.