What would you do if a pregnant woman was smoking marijuana in front of you?

I was at a birthday party a few weeks ago for my nephew. This is the child of my brother and his fiance. We were at their house. My immediate family was there (myself, my partner, mom, and sister) ..and so were his fiance’s sister and mother. Later on, a couple, who are friends with his fiance, showed up.

After my partner and I left with my brother’s other child (his older daughter), to take her home, they brought out the marijuana. My brother, his fiance, her two friends, her sister and her mother were smoking it.

Apparently, the couple who arrived late are pregnant (enough for the woman to have a large belly). My sister and mother were just leaving when they saw her smoking pot. Both wanted to say something but didn’t. They decided it was best to leave and not start anything. None of us had met this young woman until then.

What would you have done, if anything?

This isn’t meant to be a debate about pot vs alcohol vs cigarettes vs whatever.