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If you can't remember the headline of this article or are already struggling to recall some of the words at the beginning of the story, try hard to recall how much pot you smoked in your youth. A new study finds those who've used a lot of marijuana have worse memories and don't think as quickly. It's not the first study to suggest pot hurts memory, but the findings are stark. In one memory test, long-time uses remembered seven of 15 words, on average. Non-users remembered 12 of 15. On a decision-making test, those who had rarely smoked pot had impaired performance 8 percent of time, while long-term tokers had 70 percent impairment....