Here is an excerpt from the origional article Here. 

All participating doctors agreed that e-cigarettes are a significantly more healthy alternative to conventional smoking. 

The study’s outcome revealed that:

 - 6%  of smokers quit within two weeks increasing to 45% within eight weeks.

 - 52% of all patients reported both increased levels of energy and visible improvement in their physical  appearance

 - When asked what factors about smoking tobacco cigarettes were the hardest to give up, 49% of patients said nicotine cravings and 24% the habit itself.  Twenty-seven percent of all participating smokers said that a combination of all factors (the habit, nicotine, the taste and feeling of smoking) made it hard to quit.

 - When asked if an e-cigarette could act as an agent to overcome all the physical and psychological challenges to quit tobacco smoking, all doctors said “yes”.