Monetizing email list [5m email addresses]

Hey, I friend provided me with few email lists from a network of dating sites (niche dating). The majority of the users are from USA and UK. Also, I was given another email list coming from a vaping forum. I am not sure if my friend got those emails in a legal way, I don't want to risk legally, however, I know that if it is monetized correctly it can generate a lot of bucks.
What do you think?

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