She's not motivated to stop.
Smoking is very addictive, and many people i know who smokes, are
hooked on it. Some people i know, quit when their bf/gf tells them
to, or they quit together.
For your case, perhaps you could convince her that the smoke she
exhales are actually inhaled by your family? She's raising the
chances of cancer for everyone who lives in the house!
Look at her in the eyes, tell her that you love her, and that you
don't want to see her slowly wither away from cancer 10 years
later.
Alternatively, you can try being mean, tell her you won't take care
of her when she withers away 10 years later. (Depends on what your
mom's personality is like).
There's always the Nicotine sweets, gum that are in the market
which provides the same nicotine. Maybe you can ask her to try
it.
Hope to hear good news from you soon~
