We do have many decades of inhaled medications that used pg and vg carrier vapors so its not like we have zero idea on their relative safety. It may cause some

We do have many decades of inhaled medications that used pg and vg carrier vapors so its not like we have zero idea on their relative safety. It may cause some harm, but it is assuredly less harmful than smoking or else people using asthma inhalers would have shown significant problems from it.