How to get rid of cigarette smoke smell in baby clothes?

Cici • Mama and Etsy shop owner! My etsy shop is SerenadeBaby
My aunt gave me a lot of baby boy clothes that was a super big help, but she comes from a home where all the adults smoke (her, my other aunt, and my grandmother) and I couldn't even look through half of them before I became nauseous of the smell. How can I get the smell out for sure?