Could Cyst On The Lungs Of Baby Be Due To Heroin Addiction Of Parents?

I was dating a ex heroin addict an ex coke addict who relapsed back to heroin and was also using suboxone and weed. I am now 8 months pregnant and my baby has a cyst on his lungs. I was wondering if the drugs he was using may have carried through into me and into the baby. I did not know he was on drugs until after we broke up and month later I found I was pregnant. Please I really need answers!