Smokers, even casual ones, or being in proximity with smokers (in bars or restaurants) can leave quite an unpleasant smell. In breath, in clothing and in material (furniture, in your car and etc)
Especially for non smokers, this can leave a very unpleasant odor, and smokers should practice some actions to avoid the nuisance. Change clothes immediately after being in a smoke rich environment, allowing clothes to ventilate for a while. In some cases, after consistent use in smoky locations, better to wash or dry clean to get rid of the smell.