<human>: Summarize the given text in a few sentences.

My SO (M,26) and myself (F,22) have been together 10 months. Both of us are ok with drug use (provided it's not drug abuse/addiction) but are both agree that smoking cigarettes is disgusting and a massive deal breaker for us. Because of this I assumed he also felt similar about cigars, but I just found a tin of cigars in his room, which was half empty. I know cigars and cigarettes are different, and technically he didn't lie to me (because I never asked him if he smoked them) but I feel really like I *have* been lied to, and it's got me pretty upset. I knew he had smoked a cigar in the past, but I assumed it was something he did once, ages ago, and didn't intend on doing it again. 

I don't know if I really have a right to be angry with him, and I really don't know how to confront him about it. And we've been together for 10 months now without me knowing, so he can't be smoking that much and hasn't affected our relationship in any way - so should I just suck it up and deal with it on my own? Or do I confront him about it? And if so, what do I say?
<bot>: My anti-cigarette-smoking boyfriend has secretly been smoking cigars. Do I have a right to be angry? Should I confront him or leave it alone?