Less weed -> less munchies
More seriously: if it's truly problematic, it might have a medical or psychological origin. Doubtful, and not worth fretting over unnecessarily, but anything from tapeworm over certain bowel disorders through half-a-dozen eating disorders or depression can cause problems like insatiable appetite. Oh, and pregnancy, of course, jsut to make sure you can have all the bases covered for hypochondriacing properly
Assuming there's nothing serious wrong with you, there are some things to try. One important thing is that the feeling of hunger - and satisfaction - is governed by the stomach. Eating too fast will cause you to eat too much before your brain registers "oh, hey, I'm full". Likewise, if the signal "okay, we're full, stop eating" doesn't reach your brain, it'll keep thinking you're hungry. Chewing more slowly can get the mesage across more clearly, and there's always "drink half a litre of water" as well.
Still, if it's persistent, the most likely culprit is actually a dietary insufficiency: you're getting lots and lots of X, Y and Z, but are still lacking in, say, Q. Your body keeps asking for more food to get more Q, but if you don't know what Q is (could be any type of vitamin or mineral or whatever), obviously you can't compensate properly.
Another possibility is that your body is compensating after a long stressfull/high-energy period. In your case, perhaps the wind-down after Comic-con? Suddenyl your mind finds itself less occupied and tries to fill the time itself - resulting in a "craving" feeling, which we usually translate into hunger. Compare to someone who stops smoking: they constantly feel like a cigarette, which translates into more eating/snacking because it seems like they're hungry. Whixh, yes, in a roundabout way, brings us back to those munchies, which are the same thing but more extreme.
But first things first: you're eating enough, right?