Many Americans are vaping substances never meant to be inhaled, including tea, caffeine, and essential oils, a new survey shows.

Adult smokers who switched to e-cigarettes by age 39 reported more exercise, more social engagement, and overall better health.

"Failed nicotine quit attempt levels have gone back to where they were about 17 years ago for adolescents," says Richard Miech.

Mental health influences whether teens who vape will begin using cannabis, but the risk differs depending on the mental health problems they experience.

Switching to e-cigarettes that have nicotine delivery similar to regular cigarettes can help smokers quit and reduce their exposure to certain carcinogens.

The claim of "tobacco-free nicotine," from the brand Puff Bar may make young adults think e-cigarettes are less harmful, research finds.

E-cigarettes that deliver a cigarette-like amount of nicotine are associated with reduced smoking and reduced exposure to carcinogens in tobacco.

"Without a doubt, cigarettes and e-cigarettes are unhealthy and not good for lungs. However, vaping marijuana appears even worse."

People who vape are more likely to say they experience mental fog. Does vaping cause the cognitive problem, or are they self-medicating?

People who used e-cigarettes in the past were 21% more likely to develop respiratory disease, and current users had a 43% higher risk, a new study finds.