chain–smoke 
/ˈtʃeɪnˌsmoʊk/ verb
chain–smokes; chain–smoked; chain–smoking /ˈtʃeɪnˌsmoʊk/ verb : 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, plural chain–smok·ers [count]
