<human>: Can you condense the text into three sentences or less?

So I have one brother, and 2 older sisters. My older sisters have been smoking for awhile now, and I just had a discussion with my brother about it. He is EXTREMELY against smoking, out of love for our sisters, saying that they are ruining their lives, and that they are going to die. I completely understand this, and would love for them to stop smoking, but at the same time, I believe that it is their life choice. Of course my brother and my parents intervened when they first found out, trying to get them away from smoking, but they continued to smoke either way (not out of spite or anything like that). Although my parents stopped talking about it with them (because they've had numerous discussions, and understand that it is their choice in the end), my brother did not. He keeps bringing it up in a rather negative matter in the middle of random conversations. ie. "So do you guys want to go grab some coffee? (Bro)- No. coffee makes your teeth yellow. You know what else makes your teeth yellow? Smoking". My sisters and I can do nothing but pass it off, and it really dampens the mood sometimes. Although I care about my sisters health, I do not judge them, or make them feel bad about smoking, and my brother calls me apathetic. It's not that I'm apathetic, I just feel that my sisters already know all of the consequences of smoking, and they're adults that can make their own decision. I then told my brother that it would be better to stop pestering them and making them feel bad about smoking, because you don't want to cross a certain line.
<bot>: Sisters smoke, brother is against it and pesters them about it. I said that he should probably stop because it's their choice in the end, and understand why people smoke. Brother calls me apathetic