Spend the $$, time, effort and concern on helping her actually stop.
Like alcoholics and other addicts know, "it don't count till you quit".
The allegedly "safer" tar & nicotine cigs actually cause the smoker to subconsciously inhale deeper & hold the smoke in longer, as the body compensates in order to get its customary fix. Tumors of the lower lung are then more likely to result, and indeed are on the rise as people switch to so-called "safer" cigs, tragically thinking it'll help.
There are very helpful prescriptions to aid a sincere desire to stop.
Get an appointment/Call your Doc or ask any up-to-date Pharmacist for their recommendations. Research shows the newest methods/formulations help many to quit "easier" with these temporary supplements, as the body de-toxifies.
Motivation is everything, though. One suggestion might be for the 2 of you going to visit some Chemotherapy patients in the Oncology ward of your local hospital...just knock on their door...they'll be glad to have some visitors, I bet.
HTH