Buy a scale. Here in Dallas $20 of some reg is 8 grams. $20 of some good shit is 1 gram. Easy to remember.

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“They lie about marijuana. Tell you pot-smoking makes you unmotivated. Lie! When you're high, you can do everything you normally do, just as well. You just realize that it's not worth the fucking effort. There is a difference.” ~ Bill Hicks