Wow, that's funny. And you just have Google ads and stickers? Seems like you could make much more off of direct advertisers, or even find something on CJ.com
EDIT: had to add this link. Haven't laughed this hard in weeks! http://www.thathigh.com/stickiest/
What about HighTimes.com? Maybe they would advertise. Better yet, see who advertises on HighTimes, and contact those companies.
Do you have a newsletter? You could collect email addresses and send out a weekly digest or something. Put in a little more time, and offer articles and tips (?) on smoking weed. Email lists are extremely valuable.
You can definitely make way more than you are already. AdSense ("Webmaster Welfare") has pathetic CPMs. The ads its serving up on your site are irrelevant. I know creatives like to smoke weed, but Adobe Creative Suite? Seriously?
Or, you could create a little badge on your site for social proof. "We're followed by..." Keeping it up to date would be a challenge, but they probably won't unfollow you.
Seriously, e-mail those advertisers though, it will be the easiest money you ever made. They would love to advertise on your site.
"Hi, I can give you 720,000 impressions/mo to weed smokers, would you like to advertise?"
Step 2: Send an invoice using Freshbooks or Blinksale.
Step 3: Install the creative using Google Ad Manager.
You can also try setting up zones through BuySellAds.com, and advertisers can buy directly when they visit your site. They take a cut, though.