Gotta disagree here. They bust drug users (the small guy) because the goal is to try to get to the suppliers. And in the process it makes them look like they are "cleaning up". And when it comes to nicotine/tobacco, it's a really big no-no when you step on their toes. The govt needs to control tobacco movement/sales. It' s very profitable for them.
Nic Suppliers are selling product legally at this point. That could change if vaping further threatens the tobacco industry and the taxes it produces for government.
It's easier to raid suppliers than it is to raid the sanctity of a private residence. I can't see law enforcement spending the revenue to violate the rights of a citizen to confiscate something that is currently allowed to be sold on the open market.
Nicotine may be declared a controlled substance only because high milligram nic is an actual poison. Nic sold in concentrations of 24mg and below may not be a consideration.
Although I'm not worried about the future legality of vaping, I have a lifetime supply of 100mg nic in the freezer. Better safe than sorry. My 3 liters are good for 27 years of DIY at a 3mg/ml mix and 8ml daily vaping. I doubt I'll outlive my nic. If I do then I'll vape zero nic. The hand to mouth part of vaping is a large part of my hobby.