Knee surgery, Please answer!?

I had a very precise knee surgery about two weeks ago. It was a complete cartilage transplant, three broken bones on my knee, and a bullet size hole was filled. The doctor said it went very well. He said not to smoke, because my graft may not attach. Is that true? and another question is how long before i can swim, and have my life back. i just graduated high school last saturday, on crutches of course. I just want a few details on the recovery, like swimming, healing time, pressure,etc. any answers would be greatly appreciated.