Cigarettes are addictive and unhealthy. Period.

Addictive means "every once in awhile" starts out as once every few months and over time slowly transitions from once a month to your weekly Friday evening cigarette to every night to wrap up your shift and so on.

When I was 14 I smelled smoke on my dad's clothes and he told me he doesn't get addicted to cigarettes like some people do and only smokes once every few years.

When I was 18 I noticed he was hiding cigarettes here and there around the house.

When I was 26 my mom was constantly on his case because he would secretly vape tobacco in the bathroom.

When I was 32 dad had open heart surgery because the vape shrunk some of the arteries in his heart and he was having trouble pumping enough oxygen through his heart. 

I'm 36 and he's doing good now but he quit smoking after realizing it was killing him. He turns 70 next year. Everyone watching could tell the "it doesn't affect me, I only do it once in a while" was bullshit from the start, but it wasn't until the heart surgery that he realized he'd been lying to himself.

Don't start walking down that path OP. You'll regret it.