In a press release announcing the bill, Kirk warned of "zombie-like" pot smokers stumbling around the Chicago suburbs. "According to the National Survey on Drug Use and Health, more than 25 million individuals age 12 and older used marijuana in 2007 -- significantly more than any other drug," he said. "That's why Kush and other high-potency marijuana strains are so worrying. Local law enforcement reports that Kush users are 'zombie-like' because of the extreme THC levels. Drug dealers know they can make as much money selling Kush as cocaine but without the heavier sentences that accompany crack and cocaine trafficking. Higher fines and longer sentences aren't the total solution to our nation's drug problem. But our laws should keep pace with advances in the strength and cash-value of high-THC marijuana. If you can make as much money selling pot as cocaine, you should face the same penalties." Rep. Kirk appears to have swallowed the assumption that higher-potency marijuana is somehow more harmful than lower-potency pot, an old bromide dating back to former drug czar John Walters' "it's not your father's marijuana." But marijuana users say they adjust dosages to achieve the desired effect by smoking smaller amounts of more potent varieties. A user might smoke an entire blunt of low-potency Mexican brick weed, but only a couple of tokes of more potent pot, just as an alcohol user might chug down a 40-ounce bottle of malt liquor, but only a few ounces of more potent distilled spirits.