recently things have been heating up over which method of humidification is best. Although I feel this is a total personal choice no way of humidification is better than any other if your hummi stay's where you want it, then your choice is your choice. I was looking into negatives of PG usage. I have found some negatives that you guys might be interested in. The main negative that i have found is as such. with the constant use of PG every time you refill your humidification system if you constantly use PG. PG is left in solid form in the humidification system. this changes the consistency of the PG that you add every time you refill your humidification system. Although it is a very slow process after much time what ends up happening is the PG ends up being 100% instead of 50/50 and it will actually dry out the hummi and gars instead of hydrate them. this was the main negitive that i found with constant PG usage. in my personal option I think that this process would take years to get to 100% PG being that you only refill your humi system once every month or so. just food for though. I like for things to be defined, in other words i want to know why you shouldn't do something or why other options are better hope this helps somebody out