
Interesting question, Abhishek. I'll do my best to answer it with what little knowledge I have.
Considering the fact the Reiki works for Highest Good rather than a person's wishes, the client may very well not know what would best serve their Highest Good. In many cases though, the reason will be clear, but not in all. In your case, (mine too, BTW) the will to quit smoking may be enhanced, or not, depending on the underlying causes of our addiction to nicotine and the effect quitting would have on our life as a whole. To the person standing outside the box, quitting should seem to be the best that could happen, but...
If quitting smoking wouldn't serve your Highest Good, say you became irritable or hard to get along with and it would cause a rift in your personal relationships that would be harmful to you on any level at this point in your life, your Highest Good may be better served by a strengthening of your breathing and your heart instead of the will to quit. The description I used above about a terminally ill person can teach much about Highest Good too. Nothing is in life permanent, someday we must all cross over. A person with say a terminal brain dis-ease may want to receive Reiki to help cure this dis-ease, but again, it may be their time to pass over from this life to the next, so therefore, their Highest Good would be best served by making that passing as easy, peaceful and painfree as possible.
I'm working my way through my M/T training with a local Reiki Master who does a fair number of group treatments, and I participate in them as another pair of hands, giving Reiki to her clients along with 2 other R2 practioners, with the money I'd be paid for helping going completely to my M/T attunement. I've talked to most of those clients about what they feel during a session and the effects they feel after, and everyone feels that good is being done. Most are relaxed and feel a renewed vigor in their life. Some have come looking for help in quitting an addiction like smoking and feel that the Reiki has helped them immensely. None would stop coming for Reiki because it does help them on several levels. One lady, whose husband was VERY sceptical, talked him into coming in for a treatment, a one-on-one with my Master, to see if he could feel any effect. The treatment went very well, but when the guy left he told the Master that he felt nothing, he still thought Reiki was bunk, and just a way to generate an income from gullible people. His treatment was on a Thursday afternoon, and on Monday morning, his wife called to make another appointment for him because after the weekend he seemed to understand and feel what a difference it had really made in him. I was told a few days after his second treatment that he experienced a spiritual cleansing as is often the case with new clients and new practioners.
I hope I've helped you understand a little more.
tomas