how to give up smoking?and how to prevent myself smoking again?

If you are really serious about quitting, try hypnosis. I did it in 1992 and haven't smoked since. The man that helped me told us we have to want to stop in order for it to work. I was lucky, I only needed one session, he said sometimes people may need more that one. Give it a shot!

You have to be determined to stop. Whenever you get the urge, break up the cig. There might be somethings that when you eat , you do not feel like smoking, like chewing or chocolates. Try that. Else if you want to be shocked out of it, go and visit a cancer hospital and see for yourself and with the doctors the devastation it is doing. Better get a grip on yourself my friend. You have along way to go in life and what you are doing is not worth it.