The most lethal drug on the planet IS legal...alcohol. Alcohol causes nearly 4 percent of deaths worldwide, more than AIDS, tuberculosis or violence.
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You are right. As a former cop, I can say you are 100% right that alcohol is more dangerous than weed. But it is NOT more dangerous than heroine and crack. It may be more widely used, and thus have more incidents, but as far as the most dangerous drug for an individual to consume, heroine and crack are far higher than weed and alcohol.
BTW, I let more people toss or flush a few grams of weed in my patrol days than I can count. So many cops treat that shit like and open booze in public (both illegal most places). If you got a little bit, but are cool and not harming anything, probably let you toss it.
This is one place I can agree with many lefties, weed should be legal. But NOT heroine, crack, speed, meth.