That's weird.... I remember when I used to take Folic acid...that little tablet also caused like what appeared to be smoke coming out my mouth....not a lot but obviously I didn't drink enough water with it..and it could of been dissolving down my throat....Not sure...But it is strange
does he/she smoke? it might be something to do with that, or maybe the food they're eating isn't suitable for their body. hope this somewhat helps
smoking pot, from my experience, never cigs