Sorry, but what is this sentence doing in this theme? Nekouří is not a passive form, from what I can tell.
It is here to teach English speakers that what we express with the passive voice is often expressed in Czech with a reflexive or a construction with to have.
thank you. i expected people would ask a different question, i.e., what is the se doing in the sentence, or who the subject of nekouří is :-)
It is the so-called reflective passive voice, I guess.