chain-smoke
 /ˈʧeınˌsmoʊk/  verb  , -smokes, -smoked, -smoking
  : to smoke cigarettes continuously one after another
   [  no obj  ] He chain-smokes when he's under a lot of stress.
   [  + obj  ] She's been chain-smoking cigarettes for years.
  chain-smok·er  noun  ,  pl   -ers [  count  ]