That's actually a really good guess. Smoking in Indonesia is ubiquitous and the favoured type of cigarette 'kretek' (made with cloves) are rather strong. (So much so, that I can no longer buy them here or import them, which is a shame). But I would have thought that equally hard smoking China would be darker. Australia shouldn't be that light either, it isn't notable for being smoke free compared to other western countries.
Also, doesn't Russia have a really bad smoking problem? I wouldn't think it'd be so light on a map about smoking, in fact, I'd think it be one of the darkest.