I see few "merits" to pot use. The issue for me is, while I see downside to pot use, that downside is far outweighed by the downsides of making pot illegal. We waste money unsuccessfully trying to stop trafficking, create a huge black market that encourages violence, and foster disrespect for law among otherwise good citizens. The cure is far worse than the disease, and as a bonus, isn't a cure, since people who want to use pot pretty much all do so anyway. As posted before, the similarities to prohibition are remarkable.