Such a claim requires impossible amounts of hard evidence to make. There's a lot of casual smokers who never become that pack-or-two a day kind of extreme addi

Such a claim requires impossible amounts of hard evidence to make. There's a lot of casual smokers who never become that pack-or-two a day kind of extreme addict one can clearly attribute their smoking to their lung/mouth/throat cancer. But they are still more likely to develop some kind of ailment from their lighter smoking, as it's equivalent to frequently subjecting your body to a poison that enters the bloodstream. Especially since it's not necessarily going to be a respiratory cancer, attributing cause becomes ambiguous enough to to make all the stats unreliable at best. Consider the fact that some american cities ban wood burning fireplaces/stoves as a public health measure. And that's diffuse atmospheric smoke, nobody is sucking directly from the stacks day after day, year after year.