I think vaping is not dangerous if you use the correct equipment and juices. Don't over charge your batteries, use cases to protect them when travelling. Use a regulated battery and one with a 10 second auto shut off feature. Use ejuice that are approved by associations for no bad chemicals. Here in Canada I believe it's called ecta. Don't use high nicotine, don't over do it, wear gloves when using nic juices . Keep nicotine juices away from children. Now for inhaling pg and vg I believe it to be very safe, as long as its pharmasical grade which most juices are all using anyways. Flavours, well, as long as they don't have bad chemicals they should be safe. Think of inhaling food smells in a bakery, that won't kill ya. Make sure your not chain vaping so much your coils heat to the point of creating unwanted chemicals. Replace your coils when they go bad, and make sure the wicks Are well saturated.If you follow these practices I believe it to be very safe. I vape off and on 0 nic ejuice and never cough, feel gross, smell gross. To me it feels like I'm inhaling warm air, with a taste. Nothing is 100 percent safe but I can say when I smoked I could tell the damage it was doing.