Could be any number of things. Nicotine strength, type of vape, wattage, ohms, type of eliquids etc.
I can only speak for myself, having used a smok mod with crown 3 tanks, .4 ohm coils, 55 watts. I’ve also only ever used 3mg nicotine from reputable Canadian producers. Usually a 70/30 vg/pg. I’ve never experienced any heavy lungs, phlegm or any other respiratory issues from vaping. I feel about a million times better than I did when I smoked. Used to cough up all kinds of awful stuff and would frequently have issues with coughing. Quite expectedly felt like crap any time I’d work out. I’ve now vaped off and on for a couple years. About 5ml a day, which is the size of my tank. Never had any issues.
I’ve heard juuls use a different nicotine delivery system with salt vape juice and that it gives you way, way more nicotine than conventional vaping.
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