I took up smoking in my late teens because it seemed like the thing to do; all my friends did. I never smoked cigarettes by myself, only with others hanging out when I felt like I ought to have one. This was mid to late 70s, which was kind of the turning point where most of the medical community accepted the evidence linking smoking to average shorter life spans and started making a lot of noise about it. When I accepted that, I quit cold turkey and never had another. It was easy because like you, I never developed an addiction to cigarettes.