Marijuana has become much more potent in the past few...

Marijuana has become much more potent in the past few years. The illegal growers have selectively bred the more potent plants and the amount of the active ingredient —- known as THC — has increased from about 3 percent to about 15 percent. Credit: iStock

Whenever I hear about the legalization of marijuana, I can't help but think about how the opium dens of the late 19th century were used to control a populace in China ["Pot & politics," News, April 6].

I guess not too many people bother to read history anymore -- or are too "happy" on pot to care.

Elgin Alexander, Smithtown
 

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