Vapers wanted: does Low-Nicotine juice really cut harm?

This study watches 120 everyday vapers to see if those who use lower nicotine e-liquids actually take in less nicotine and have fewer harmful chemicals in their body compared to those using higher nicotine. Participants will use their own devices as usual for two weeks, answer daily mood and craving questions, and provide saliva, urine, and blood samples. The goal is to gather evidence that could guide future rules on nicotine levels in e-liquids.