Being popular is not so important that you would risk ruining your health for. I don't think you should do cocaine or any drugs for that matter. If you feel like your friends are forcing to do something bad and something you don't want to do, I suggest that you stop hanging out with people like that. But if you do want to still hang with them, then you should at least think twice before you do drugs. I'm pretty sure you know that drugs are bad and hopefully you'll do the right thing.
Signed Mr.Swag