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These are now banned in the UK due to breaches in regulation, the increase in youth vaping and concerns over environmental waste

One study suggests that smoke exposure is one of the biggest risk factors for sudden infant death syndrome (SIDS)

In 2017, John Hopkins Bloomberg School of Public Health released a study citing heavy metals found in e-cigarette vapors that have been shown to damage the brain, heart, liver, and lung

The strongest design would follow an entire population of youth beginning at an age at which risk of use of any product is negligible (e.g., 10 years old) and investigate time-varying associations between e-cigarette ever use and later combustible tobacco cigarette use at multiple developmental stages throughout the entire period of risk (e.g., up until age 29), while using multiple methods to establish temporal precedence of vaping relative to smoking

Gupta, R., Gupta, S., Sharma, S., Sinha, D