smoking problems

I am planning to quit smoking from last 10 years but could not do that. I tried different methods to quit smoking like

1) Reducing the number of cigarettes

2) Tried a bit to smoke low nicotine cigarettes.

3) Tried pathes- for which i had to spend lot of money.

4) Nicotine chewing gums.I tried all the things but could not succeed.

I am feeling bad because my health is getting deterioated and dont have stamina what i used to have 10 years back.

I am getting some breathing problems because of it.

I need to find out any other ways i can quit smoking.If any one has any suggestions it will be great help.