Do you smell pot when you smoke regular cigarettes?

Both my husband and I are fully grown adults who smoke Marlboro Reds and Newports. On random occasions when we are nowhere near anyone else who is smoking ANYthing else, we both smell the weed in our own or each other's cigarette! We can't believe it and it is a funny topic of conversation every time it pops up. I can't imagine we are mistakenly smelling anything else that also smells like pot that would be in cigarettes. I do not put this past Philip Morris and friends, and I'm interested to know what others think. However I am mostly wondering if anyone else has experienced this. No one ever talks about it, and I can't believe we are the only 2 who smoke these very popular brands who experience this.