Hi Benz,
I feel much sympathy with you since I had the habit of smoking quite a long time. Especially for the young believers, it is quite difficult to stop the old habit and it is quite understandable.
I was attending a Methodist church, then a Presbyterian Church after I was baptized at a Methodist church. But as you know many of those church people were smoking, especially young people there. Thereafter I was born again during a suicide attempt. I found myself died already when I was reading Galatians 2:20 and there was no need for suicide but the joy was overwhelming me.
But the habit of smoking didn't disappear quickly. It took about 2 months after I was born again. Then I stopped the smoking, but thereafter, after 3 years, I had some stressful job then I re-started the smoking from time to time, then stopped it and re-start, then stop some weeks or some months, then re-started only a little smoking again. But when I moved to so-called Plymouth Brethren, the church was quite strict for all the life style, and for the discipline, and when I participate in the Lord Supper every week, I could not take the Bread after the week during which I smoke. Then I stopped it completely. It was 20 years ago and I have a habit of reading Bible or Christian books very much.
For young believers, it must be difficult to avoid thinking about smoking.
I also tried to use Self Hypnosis and Breathing thru the belly etc, before I was born again, but in vain. Often I used chewing peanuts. I still think smoking is a kind of oral complex and it can be replaced with chewing something and peanuts are not bad. Gums are bad for teeth. I would recommend you to pray God to remove your habit, pray God transform you to be indulged in learning Bible, studying the Words of God, to be alienated from the worldly friends, to find a new friends in Christ Jesus, to remove even the habit of drinking alcohol if any, to find the joy in the new life style, to esteem the body which is the temple and the dwelling place of the Holy Spirit, not to damage or destroy it for the lust of flesh, to use and strengthen the body for the glory of God. If it is difficult for you, try to find out some church group which is strict in life style.
I can recommend some books written by PB writers which can help you
understand the Bible.
http://www.plymouthbrethren.org/index.php?scid=1
I like the writings by William McDonald who is still preaching the Gospel at the age of 97 in Sacramento,
http://www.plymouthbrethren.org/author.php?author_id=8&scid=0
and John Nelson Darby who was a Bible translator and preacher living as a bachelor till 83 of age.
http://www.plymouthbrethren.org/author.php?author_id=7&scid=0
May God keep you in good health thru the redemption by Jesus Christ.
Eli