Lavender cigarettes sound fire though
i'm not disagreeing, merely adding the context that there's varying degrees of harmful things. The relative level of carcinogens is relevant, and some things combust in very toxic forms. All smoking is going to be harmful, but the degree to which can vary like one hundred fold. Hookah for instance is WAY worse for than you than smoking weed via a bong, it's not even remotely close.
Humans have lived closely around campfires for hundreds of thousands of years. Obviously it may have shortened our average lifespans in terms of lung cancer, but it's not quite the same as people who are involved in a single extremely toxic fires without respiration protection - or even those who have to live next to toxic polluting factories. They can get diseases or die from a single exposure or within a matter of months.