Pretty much what I do to keep my high for a longer period of time is a few things;
1. Don't drink a lot of caffeine.
2. Don't subdue to the munchies! As much as you may want some food, DON'T. As soon as you eat, the highness goes away, man.
3. If you have a glass pipe, (like me) or any type of pipe, I guess, get a bobby pin, and straighten it, even a simple paperclip would do, anything long and straight, and get inside your pipe and clean it, the literal bowl is what you want to focus on, light your lighter on it for a few seconds, to help melt the resin, and get the bobbypin ect, and than scrape off the exess shit that gets stuck in your bowl. Heat it a little bit, (with your lighter) and than put your weed in, with the ball of resin put it on top of the weed, and enjoy. It'll bubble a bit at first, but it gets you off the charts high. My ex bf taught me this, and now i'm completely HOOKED.
Every time I'm running low on weed, I just clean my pipe really good, and smoke the shit that comes out.
Have fun with it, and it's not bad for you, I thought it was cause of the bubbling, but typically all it is as all the THC from your past weed, all in a little ball. No wonder it gets you so fucked up.
Have fun c;