Giving up smoking is not easy, but the reason most people fail is because they think they "ought to" give up - and that is very very different to really "wanting to" give up. There is a huge gulf between the two, but if you decide you really want to - then you will succeed.
I would suggest writing down a list of the reasons you want to give up, the benefits of doing so and what you will gain. Every time you are tempted, take out this list and read through it. It should help.
That in itself should stop you physically smoking.
Withdrawal from the drug side of it - I found the nicotine gum helped, though only ever really needed it with a beer.
If none of that works, another suggestion is a good hypnotist, works wonders for some people.
Good luck.