Trust me, it wasn't a waste of 30 bucks. I'm sure you've wasted 30 bucks on plenty of other effects. I give you knowledge on everything you can know about producing smoke. I give you knowledge on how to save tons of money on how to make DIY smoke gimmicks, instead of having to rely on other smoke products that costs up to 150$ and if it breaks or you need refills, they go at an unreasonable price. So no, it wasn't a waste. This knowledge you will carry with the rest of your life.