I concur with all of @erikaharris' negative effects. Though I'd like to add:

1. Sorrow -- when my stash runs out and I have to go get more.
2. Planking -- when I've smoked too much and cannot move.
3. Spinning -- when I've smoked an especially potent strain of hash and the world starts spinning, which then leads back to #2.

I've taken to traveling to the majestic lands that have legalized cannabis to undercut the issues involved in #1. While visiting the Netherlands, I learned to keep a glass of sugar water at the table to mitigate the effects of #3. And, these days, I seriously only deal with #2 when I'm battling insomnia and have access to my bed where planking is ideal.

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