OK, glad to see that this has come up as there was a similar thread somewhere and I will make most of the same comments here.
The first thing I would recommend is that ejuice producers/mixers (no matter how much or how little you mix and sell) is to voluntarily put labels on their juices (or on a card that could be mailed with bottles of juice) that would fall within the standards that food labels have had to fall within. Yes, that probably means defining what a serving of ejuice is and a reasonable (folks, it doesn't have to be exact down to the micromilligram) estimate on how much nicotine is in a serving. I know that this step will be tough to do, but if Dr. Pepper, Coke, and the major soda makers can put what is in their products without divulging the secret of how much of what and how it is mixed, then, well, ejuice makers should be able to do the same.
The next thing is that they need to voluntarily submit to health and safety inspections and this also means getting their employees up to date on all of the info regarding the ingredients they work with as well as make sure that all of their employees know where the MSDS sheets are located on every ingredient. Employers, you need to be able to run routine hazard drills so that every employee knows how to respond in case of an emergency and have open discussions to consider any input on how those responses can be improved.
The first part of this is easy, what I am getting ready to suggest next is not.
All of the producers need to work together to come up with a quality assurance (QA) program. That means that the juices need to be tested to be able to measure up to the claims that the producer makes (If it does or doesn't contain certain ingredients, and if possible be able to measure any substances that is in the vapor....yeah, easier said than done). I know that this process will take a lot of trial and error, but as information is gathered on testing procedures, share it with other producers. This way all will benefit in the general development of testing procedures.
The next thing that needs to be done is that testing on the validity and safety of vaping needs to be done. This is easier said than done here in the states because of current politics.
I also agree on a couple of things that has already been mentioned here in this thread. First, folks, this industry currently has enough on its plate, stop adding ingredients such as vitamins, caffeine (yeah, there are days that I would definitely love to be able to inhale massive amounts of it) and other substances that could muck up the development of this industry here in the states. Yes, I know it might immediately cost you some business, but in the long term you would gain greater amounts of business as well as credibility.
The other thing I will agree on is that there needs to be an established set of safety standards that the devices have to meet.
OK, think I have said enough for the moment.
Anne