I notice a lot of members are saying "It's her body, let her do what she wants" But that doesn't help, obviously she is worried about her mom's health, and wants help to make her mom quit. =)Also, she is worried because it affects her mothers health, and herself + her sister, if the mother was doing drugs or drinks too much, I doubt you would be saying "Its her body, let her do what she wants" . Thanks
What I'd suggest is to ask your mom questions innocently like "Mom, when did you start smoking?" and "Did your parents like it when you smoked?". Also, this may not work, depending on how your mother will react, but when she is smoking, either hold your breath as you walk by, or just walk by, and when you get a few feet away from her, cough. Not "OH GAWSHZ! MY THROAT!" kind of cough. lol.
Well, I hope this helps, KC8