The reason things eat away at tanks has nothing to do with Toxicity really, its about their potential hydrogen levels or "pH". The more acidic flavors such as citrus will have a low pH and cause erosion on non resistant parts. You can get o-rings from swimming pool supply shops that are resistant to such erosion and deformation from low pH and avoid the issue all together.
As far as the inhalation of PG, its being studied for multiple air born applications to prevent the spread of germs. There has never been a case of electronic cigarette usage causing negative effects on the human body beyond withdrawal symptoms, or misuse causing high nicotine levels or mild allergic reactions to PG. To be honest just be responsible and you will be fine, the alternative is proven to kill so the choice is quite simple.
Edit: I think a lot of the irritation caused by certain juices can be attributed to the pH of the substance. I don't have a kit to test it in front of me but it would be interested to figure out. The human body has a pH of 7.4 so ideally you would vape or consume things with a pH close to that. This also can cause heartburn, etc as it causes a micro chemical reaction (same as throwing vinegar on baking soda).
As far as the inhalation of PG, its being studied for multiple air born applications to prevent the spread of germs. There has never been a case of electronic cigarette usage causing negative effects on the human body beyond withdrawal symptoms, or misuse causing high nicotine levels or mild allergic reactions to PG. To be honest just be responsible and you will be fine, the alternative is proven to kill so the choice is quite simple.
Edit: I think a lot of the irritation caused by certain juices can be attributed to the pH of the substance. I don't have a kit to test it in front of me but it would be interested to figure out. The human body has a pH of 7.4 so ideally you would vape or consume things with a pH close to that. This also can cause heartburn, etc as it causes a micro chemical reaction (same as throwing vinegar on baking soda).
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