Smokers' rhymes with:
nonsmokers, nonsmokers', smoker's, smokers, nonsmokers, nonsmokers', smoker's, smokers, broker's, brokers, brokers', exbroker's, exbrokers, folkers, jokers, kocur's, nonsmokers, nonsmokers', smoker's, smokers
Smokers' sounds like:
sankara's, semisecrecy, sengers, sensor's, sensors, shoemakers, singer's, singers, smoker's, smokers, snaggers, sneakers, snickers, swingers