Are you sure?
Take a look:
Patent US20150034103 - Electronic cigarette - Google Patents
The patent includes 17 (!) claims. Wide field for litigation.
All patents belonging to BT (as this one) are bad for vapers.
Most patents include up to 20 claims (after that you have to pay higher filing fees for more), but what matters is the independent claims of which there are typically three. All of them are directed to the same thing, as shown by independent claim 1.
Claim 1: An electronic cigarette comprising:
(a) a housing;
(b) liquid storage within the housing;
(c) a mesh element in contact with the liquid storage; and
(d) a heater spaced apart from the mesh element and positioned to heat air which flows through the mesh element.
Claims are comprised of elements, shown here as items (a), (b), (c), and (d). Claim elements individually can refer to the prior art, because such prior art may be necessary to use the invention. However, at least one claim element must be new, which here is the last claim element (d). Should the inventor obtain these claims in a patent, every claim element must be performed by the device for it to infringe. It's not enough that a device does (a) thru (c), it must also do (d).
As to the dependent claims, one only infringes a dependent claim if they also infringe the independent claim. So if dependent claim 2 adds element (e), then a device must perform (a) through (e).