We know that smoke itself is really really bad for you. Open fire is bad for you.
Sitting around campfire with a glass in your hand and a guitar might be really really bad for you.
Sitting around a campfire once a month will likely increase your cancer risk. But it increases your cancer risk way, way less than smoking a pack of cigarettes every day.
Similarly, the World Health Organization is confident that smoked meats increase cancer risk. But that makes no statement about how much more likely you are to get cancer. I'm confident that eating undercooked chicken raises my risk for salmonella; I'm equally confident that eating a raw and expired piece of chicken also raises my risk of salmonella. But I would not say that each of those raises my salmonella risk by the same amount.
See the difference?
Smoking itself cause damage and disease that isn't limited to just cancer though.