Lying or paranoid?

My SO does not smoke cigarettes bc I hate them. He use to though. He has smoked a couple when we've been out drinking but always ask me if its cool so I've always been okay with that, bc I appriciate his effort in trying to quit for me. 
I'm at his house right now, we were about to go to bed, and his roommate said  did John (there friend that isn't over) leave his cigarettes over here and winked at my SO. His roommate had no idea I was looking at him. I felt like it was actually my SO pack and his roommate was covering for him. 
When we went to his bedroom, I asked him why his roommate winked and he played dumb and said he had no idea.... I told my SO that I don't believe him and he's still playing dumb. What do you think?

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