Ultimately, it is one's own decision whether or not they should drink. This reminds me of my boyfriend, who disagrees with my pot smoking. However, I control my own life so I continue to smoke pot. He drinks alcohol, so I'm gonna smoke. If someone really doesn't want to be with someone because of something they partake in, then it's not meant to be. You can't go into a relationship with the intent of changing someone's ways. It will ALWAYS result in a mess.
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"In a world we need to share;
it's not enough to stand and stare." --Pink Floyd