How to quit weed

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I've been trying to quit weed for a long time but my boyfriend with whom I live with smokes too. I find it really hard to stop with no solid support system. I know it takes will power and determination but its hard when someone is smoking next to you when your trying to stop. Even if it is in a different room it's still hard becuase I know what is being done. What would be the best advice that someone can give me.