Yes, you should tell her, I do agree with that, you should tell her without emotionally blackmailing her, or demanding she stop it. If it's not a big deal to her, she will then stop, but If it's a big deal to her, then you know it's her lifestyle and she's not ready to change it, and if it's like that, you can either accept it or move on. Maybe I'm projecting my own emotional baggage here, because my ex slowly but steadily alienated me from my active social life, and it was such an ugly experience that I don't wish it for anyone, especially someone you "love". Last year I was with a girl that loved to smoke pot. I also like to have a few puffs, like once or twice a year, but not on a regular basis. It didn't even cross my mind to try changing that. All of her friends smoked, her whole social circle was like that. For me that was a sign she's not the right girl for me, so I broke it off. There were some other quirks that she wasn't going to change and I accepted that, and she accepted mine, but this wasn't something I could accept and something she could change at that particular moment in her life, so that was that
