Weed is still illegal for the majority of us. Drinking coffee, smoking cigs excessively, and chronically masturbating ain't gonna screw you on a UA and is more socially acceptable. We're not saying weed is bad, or good for the record. We're saying weed is not applicable to this guy's situation. It would be similar to someone telling me "Yo bro, you can take tramadol cuz it's non-narcotic and relaxes you and bla bla blah, and you're not doing H". Granted trams are not my drug of choice, it's been shown that addicts who use ANY substance have a higher chance to relapse on their drug of choice. It's a gamble, like playing the lottery: You can't lose if you don't play.
