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Vaping involves heating an oil substance that can then produce a vapor that is inhaled by the user

Although vaping replaces smoking's nicotine, it does not replace the thousands of other chemicals in cigarette smoke, which interact with the body in complex ways that scientists are still unable to fully comprehend

Before his death, the Hollywood actor had been open about dealing with health challenges, including a diagnosis of Parkinson's disease, which he shared via social media in December

Tobacco researcher Michael Fiore was not involved in the study, but wrote a commentary in the journal

Previous research found that one standard vape cartridge has the same amount of nicotine as 20 cigarettes