> Marijuana is as addictive as potatoes.
Maybe we disagree on how addictive potatoes are? Marijuana is fairly addictive, with about 9% of users becoming addicted.[1]
Alcohol's quite addictive too. I don't know whether it's more or less so than marijuana. But with alcohol, we have what we have. If I were designing policy and we didn't have the drinking culture that we do, I'd be hoping we wouldn't end up here.
All I'm saying is this: it's actually a bad thing if lots more people end up smoking lots more weed. It's bad in two ways. One, it's bad intrinsically, because I do think that smoking weed three or four times a week demotivates you and keeps you from getting your shit done. Two, we need to learn how to legalise drugs without use increasing massively, because we've got a lot more drugs to legalise.
[1] Number pulled from the summary here: http://slatestarcodex.com/2014/01/05/marijuana-much-more-tha... , citing research here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3371269/ . I haven't read the paper, but I do trust this blog a lot.