Is ok to tooth implant for my father he is 65 old and he smokes , he can't breath well ?

Possibly: He really needs to have a discussion with an oral surgeon about his complete medical history. Smoking alone does not automatically preclude someone from getting an implant, but the fact that he has breathing problems leads me to believe that he is a heavy smoker. There are a number of medical issues that can lower the success rate of an implant (such as smoking), but he still may be a candidate.

Maybe: Your dentist needs to do a thorough review of your father's health history before he decides to place a dental implant. Smoking is sometimes a contraindication to dental implantation, but I have placed implants in a smoker before. It's up to your dentist's to make the final decision. Implants are a very successful solution to tooth loss.

Maybe...: The smoking itself might now be a problem though smoking does reduce the rate of success; however, the fact you mentioned, he has breathing problems suggest there may be other health issues that need to be considered. Your father should have a discussion on possible complication, risks, and benefits of the different treatment options.

More info needed: Only after a complete medical and dental history, clinical exam and radiographs should anyone discuss treatment options with your dad either for the missing tooth in question, or any other dental treatment. The issues that you mentioned do not preclude placement of an implant, but may affect its chances of success.