I don't think your numbers for Germany are right. According to [1], the rate is 25% for people aged 15+. It's twice as high for people of low social status compared than people of high social status [2].

[1] https://en.wikipedia.org/wiki/Smoking_in_Germany [2] http://edoc.rki.de/oa/articles/reEi8wDOV3B1g/PDF/25UH9cUwefu... page 4