The phrase "occasional cigarette" refers to someone who smokes a cigarette every now and then or only sometimes. They do not smoke cigarettes regularly or on a daily basis. Full definition
Just like some people can stop at two cocktails and others can smoke the occasional cigarette only once or twice a year, some people are more prone to developing a social media addiction than others. (inc.com)
Asked what his luxury item would be, he replied: «I have a confession to make which is I do like the occasional cigarette. (politics.co.uk)
Ditto Gwyneth Paltrow, whom people perennially want to be like (though please recall that Gwyneth once admitted she loves the occasional cigarette), and Beautycounter's founder Gregg Renfrew, who has a long resume in the retail sector. (racked.com)