I would suggest that you hire a virtual assistant to come up with a master list of vaping e-cigarette blogs and other resource websites.
You should instruct this person to rank all those websites based on Alexa score.
You should also look for indirect indications of traffic like backlinks and social media mentions.
The typical virtual assistant should do this for you.
Once that person has given you a report, you can then instruct that person to contact certain blogs especially ones that readily take advertising.
If you play your cards right, chances are you might hit upon a fairly cheap source of vaping traffic.
A lot of advertisers tend to focus only on a handful of sites.
There are many other sites that get a lot of traffic and they're probably desperate for advertiser revenue.
So, you might be able to cut a very nice deal.