Should one be trying drugs before having children, after, or neither?

I'm 18 y.o. I live with a d*ckweed as*hole Dad who doesn't give a sh*t about anything or anyone other than himself. He constantly tells me stories about his experiences with drugs such as weed, ecstasy and cocaine. A couple of years ago I found out that he first tried drugs when he was 35 which was when I was 5 y.o. He said the same about my mother. Last year he made me promise that I never try drugs before having children. Those two ogies made me think "Why would he want me to have drugs AFTER I have children?" Perhaps I get the point from a health perspective (like if I had really bad side effects and if they altered my genetics in some way that would carry on to my child), but other than that I don't get it. My friends share my point of view. I'd rather have my fun now than later. So I was considering trying ecstasy soon as I've heard many appealing things about it, as well as cocaine and shisha. I don't think one e pill, one line of coke and a shisha session would hurt me, would they? No smart answers please, just your opinions.