Synthetic Marijuana's Effects on a Toddler

How dangerous is it for a mom to expose her 14 month old son to secondhand spice (fake weed) smoke? My friend is doing this and I am worried that she could be hurting her son. She believes that weed is ok and this is ok too. I am trying to tell her that nobody even knows what is in this and so how can she know it is not harmful for her son who is probably tripping his head off everytime he comes into the room. If she won’t stop doing it what should I do? She is not really a person I like, just a close friend of my roommate who likes to smoke in my house (in her room) with her son playing with toys on the floor. My roommate is a nice person by the way who is also upset by this but she is honestly intimidated by her friend and can’t or won’t tell her to stop doing what she is doing. My roommate is the lease holder and I am her tenant and I do not want to move out so I am hoping to not cause major drama.