Let's for a second forget about emphysema, bronchitis, chronic obstructive pulmonary diseases and lung cancer. Although these are a all life threatening effects associated with smoking (and not yet formally linked to vaping), lets discount them for the sake of this discussion. This by no means suggests that one must overlook the presence of other particles in vapour, like formaldehyde, that when inhaled in large quantities can be harmful.
Let's focus on nicotine. Like most people here, I too have substituted smoking with vaping. It has been good so far since I have been taking in large quantities of nicotine. Although my stamina (running performance, your perv.) has increased marginally along with a slow recovery of the oral cavity; I don't see much improvements in the nether regions.
Nicotine is a known vasoconstrictor, which means it reduces blood flow to different parts of the body. Again, this affects people differently. But the most common area for blood flow restriction, like all vasoconstrictors, is below the belt. What's worse is it allows plaque formation in arteries, making erectile dysfunction (ED) a long term effect.
Now, one thing is for certain. Vaping today doesn't mean your closed for business tomorrow. It just means your shop will get smaller each day/month/year until you're closed for business. Lady-Vape/Nicotiners are luckier in this regard.
For those men who are done procreating and fornicating, you can write-off ED to the price of getting old. But those who believe in men-no-pause, quitting nicotine is just a baby step forward if you have already quit smoking.
I for one am definitely going to drop down to 3 mg/ml asap.