Been smoking all my life (in the UK) and never heard much talk about 420. It's only since I've started visiting sites like this that I found out about it. It's certainly not a "worldwide" celebration. In the UK not many people have heard of it, and even fewer give a toss.

Not remotely interested in it, although I'll still get baked, because it's a Friday and I always like to get baked on days that end with a "y".