I've met with DB recently and usually check beforehand whether the companion is a smoker or not (I was so excited to meet him that I forgot). I could definitely tell he is a smoker but only after some very enthusiastic tongue gymnastics. I didn't notice, for example, from his clothes, hair, body scent etc. I think he does a great job with his hygiene so if I weren't so sensitive I'm not sure I would have been able to tell. Regardless, he's amazing and would love to see him again!