C. Three

Think of it this way: Individual X has smoked 2 packs per day for 30 years. She has tried, unsuccessfully, to quit smoking using the nicotine patch and nicotine gum. Finally, she has successfully quit smoking using electronic cigarettes.

LAST：2014 wholesale eluv innovative mini ecig eluv with mini CE4 atomizer |NEXT：May of 2014 Itsuwa newest e cigarette Wat-Hookah