Can he??

Before my amazing SO was mine, someone did a horrible thing to him and destroyed his heart. She faked an entire pregnancy and then told him the baby died at birth. She stuck to her story and refused the truth. He wanted nothing more then to be a dad. My poor babe :( breaks my heart so much. He developed a drug problem. He is amazing and clean and sober now! We are moving forward with our lives and we've decided to try for a baby! This is our first month ttc.... my question is... with the amount and length of his drug use 2-3years.. could this effect our chances of fertility?