A vapor is a substance in gas form below its critical temperature and smoke is the visible emission produced from combustion.As am I - I often use an ECig, and have ALWAYS gone to a designated smoking area to do so.
HOWEVER - the policy was VERY poorly worded: It could be used AGAINST them... Someone is going to lodge a complaint over items that have nothing to DO with the inhalation of Nicotine - then try to sue.
"e. For the comfort of all Guests, smoking of tobacco, e-cigarettes or other products that produce a vapor or smoke are allowed only in designated smoking areas."
Does WDW realize that they have a formal policy regulating asthma inhalers and spray on sunscreen to designated smoking areas? This is "another product", and it produces "a vapor". All they had to do was spell out devices emitting any measurable quantity of Nicotine - as in, over the detection limit of any current instrumentation.
How to fix the mess: exclude medical devices - asthma inhalers, oxygen tanks, spray on sunscreen... and watch out for medical MJ, if you go for "medical devices".
Both albuterol sulfate and sunscreen are classified as aerosols, which is a colloidal suspension of particles dispersed in air or gas.
So if you want to get absolutely technical, asthma medication and sunscreen are allowed park wide under the new rules, but hot beverages such as coffee should be restricted to the smoking areas.