Collocations for smoker - noun

chain, heavy
light
regular
pack-a-day, two-pack-a-day, etc. (AmE)
20-a-day, 40-a-day, etc. (BrE)
A 20-a-day smoker spends around £1 800 a year on cigarettes.

passive (BrE)
the risk of lung cancer in passive smokers

former
a former smoker who quit 20 years ago

cigar, cigarette, pipe
cannabis (esp. BrE), marijuana (esp. AmE), pot (informal)

smokers and non-smokers
separate rooms for smokers and non-smokers

a smoker's cough