it can be so frustrating dealing with non-tokers... you can talk about ur own experiences and show them every study ever done under the sun... you might even convince the person all the anti-pot ads are wrong, and that there are much worse legal drugs out there, but the argument still almost always ends with:
them- "well, it's still illegal"
me- "well, it shouldn't be"
them- "doesn't matter, it's still illegal"
me- "go fuck yourself"
lol