If you tried marijuana in high school or college and turned out fine, it makes sense that you'd wonder what the big deal is. But what's on the market today barely resembles what you knew. THC potency has increased by more than 1,000% since the 1980s — and research now links regular use of today's high-potency products to psychosis, bipolar disorder, and serious psychiatric illness in young people. The good news: parents who understand what their child is actually using have more influence over the outcome than they realize.

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