Birth Defect that never Existed

Do you see all the birth defects around now in the 21st century.  They never existed in the 60's and 70's.  I believe and I am sure it is coming from all the drug users.  Autism was hardly know of years ago.  Even though some people stopped using drugs it affected their genes and as a result you have all these birth defects now.  ADD if it even exist comes from drug users.  You alter your genes when you use drugs.  This is all the results of it.