Yes, I have been to functions where there was a hell of a lot of smoke and never experienced anything other than the stink permeating my clothes. I would say if you are getting high that it is more than likely to be the placebo effect. I really don't think there is any reason to worry about getting addicted to anything.

There are some good choices above about contacting police. I have another thought though. I would suggest talking to the property manager or owner about this.

I agree too you have rights.

My other thought pertains to any rights this other fellow might have, mainly is this medicinal weed? He then has the right to light up. But, with that said, there are other ways people are often encouraged to get their dose and that is by consuming edibles and the usage of other products like oils.

Again, talking to the property manager/owner could help with this.