How To Get Rid Of Premature Ejaculation?

I am 36 year old and i got married in April 2010. I am 6ft and I weigh 65 Kgs. I never had sex prior to my marriage with anyone or even my wife ( then girlfriend ). Its been an year now and since the first time, i am facing this Premature Ejaculation. That is, i ejaculate within a minute while intercourse.

Before getting married, I used to Mastrubate. I am not sure if Mastrubation has anything to do with Premature Ejaculation. ( Let me know, if it is related in some way). Moreover, I do smoke and I had been smoking for almost 15+ years now.

Also, my foreskin is tight and it doesn't retract while the penis gets erected. For past couple of days I am manually retracting it on daily basis on a doctor's advice ( locallly ). During the first month of my married life ( sex life, to be precise ), I even had kind of erection problem. I couldn't hold an erection for even a minute. The penis goes flacid right when I try to insert ( probably tight foreskin, not sure though ). I would like to confirm, if tight foreskin could cause Premature Ejaculation.?

My wife gave birth to a Baby Boy on March 12th 2011. Please advice on how to get rid of this Premature Ejaculation as we will be resuming sexual life again shortly. I want to satisfy my partner. She doesn't have anything to complain but still...