You've heard the warnings. Today's marijuana is stronger than ever! Weed used to be mild fun, now it's mind-blowingly potent and dangerous! Could it be true? I've been running a personal trial of cannabis potency with heavy daily sampling since 1988, and my experience is that the holy herb is pretty much the same now as it always was. But what do I know? Maybe smoking dozens of phat joints a day for 12,000 days…