Aside from the weight room activity, you are aware that vapor inhalation is very different that inhalation of smoke from an analog. Tobacco companies put chemicals into the tobacco that smooths out the throat hit in order to keep you smoking. Vaping on a propylene glycol base is new to your system. High nicotine levels tend to also increase throat hit; sometimes significantly. To reduce coughing from vapor you need to drink plenty of fluids and try dropping the nic levels of your juices. You can easily cut your e-juice with vegetable glycerine (available at most drug stores) to reduce nic levels. It will also dilute the flavor of your liquid, but you will easily determine is the hig nic level is a component of the discomfort of your throat.
