I randomly started to cry while smoking weed.?!

The other day, i smoked weed for the first time in my life. My sister came over with two friends, and they wanted to smoke me up so I had known that they were coming for a few days in advance, and I was excited, but while I was waiting for them to get here, I felt wrong, and like I didn't want to do it anymore. So, they showed me the ways, and I went along, and them once I thought that I getting high, I started to laugh at what they were laughing at. Then all I can remember is that while I was laughing, I felt like eric from that 70's show when they are in the circle, so I thought soooo....this what it's like. then they asked me whats wrong, then I realize that I was wiping tears off my eyes. After I realized that, I headed out of the Kitchen and into the bathroom, and I realized that I had cryed. On my way to the kitchen, I said why am I doing this......what am I doing

I think that I cryed because subconsiously i didn't want to smoke, but I forced myself to. The week before, at school we had a speaker tell us how her son died from smoking weed which led him to heroin. this had an effect on my reluctance to smoke, otherwise i would have been fine with it.