How to quit or cut down on smoking cigarettes when I’m surrounded by smokers?

My family and partner smokes cigarettes, and I do aswell, I have for 4 years, but I feel like it’s time for me to stop. It’s starting to hurt my chest and I’m coughing up black stuff. How do I quit when I’m surrounded by smoke? I’ve already tried patches and gum the last few months but they aren’t working.
How to quit or cut down on smoking cigarettes when I’m surrounded by smokers?
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