<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hey, I'm currently in a bit of a pickle, and I would like you guys to help me see whether I'm being totally irrational or not.

For years I've been quite anti-weed, not to the extent of me wanting it to be always illegal, but enough for me to never try it myself, while also feeling slightly disapproving when friends take it. I usually see myself as a fairly laid back guy, but for some reason I get quite touchy/conservative on the issue of drugs. I include tabacco smoking in this, which I believe contributed to my diagnosis of asthma when growing up (my parents smoked). 

An issue now comes with my current girlfriend; she smokes weed occasionally. I've known her for years, but only recently have been going out. She's very open in the fact that she smokes it, and enjoys it. She also knows that I'm very reserved on the issue, which did cause arguments when we were friends a few years ago. I've chilled out a bit since then, but am still reserved on the issue. She wants me to chill even more, to the extent for me to at least try it before I make my decision. I'm not sure if I can/should...

After seeing the floods of 'Yes on Prop 19' here, I'm questioning my views on the whole thing, and whether I'm being a total prude about it all. Do I have anything to worry about when trying it? Are my views fairly standard or extreme?

A bit of background, I'm a computer scientist currently doing a Masters. In the UK it's a Class B drug, see  for legal details.
<bot>: I'm worried about trying cannabis, and feel my views about it are extreme. I need some 3rd party views about this; as you can tell I'm quite confused about it all.