@Vocalek : Very helpful post.I believed from the day I heard and knew of e-cigs;its an alternative addiction.Like people sniff glue,nail polish remover and hundreds of other stuffs,its like that.e-cig helped me to stop analog cigs- the more dangerous one,I am happy for the fact.I had a WRONG impression,that the companies add something to
e-liquid;so,I prepared e-liq in my lab (PG based).I concluded that PG vapor itself has the ability to make one addicted.I had to test it.It would sound inhuman,but I exposed 2 rabbits to PG vapor (5 minx4 times a dayx 4 days)-two after major meals,two before their defecation.On the 5th day,I stopped it.They were aggressive,a bit constipated too.The control rabbit (one) was exposed to water vapour.
The rabbits are in good health now,dont worry

I have no intension to make this report forwarded to any organization,for several reasons.
It is evident to me,I have to quit e-cig too for the benefit of not only my family,but for all who will be benefited by me,directly or indirectly.
Hope it helps some one.
By the way,PG vapor has a bronchodilator action too,(like albuterol (aka Salbutamol))-but the mechanism of action is different),so,asthmatics may find a "relief"-this is from my personal experience-I have asthma.But,I made a peripheral blood film of me,examined under microscope-I have noted the reduced Eosinophil count,reduced reticulocyte count,shift to left of neutrophil-an effect that is produced by high dose prolonged steroid use.
I need more opinion from the super specialists...