minimum age to buy cigarettes A sign with the legal purchase and tobacco products stands behind the counter of a retail store in New York City on April 23, 2013. New York City Mayor Tobacco 21 | FDA

Alcohol is an example of a gateway substance because although it is legal and not considered a hard drug, it can lead people to other more dangerous substances

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Certainly I understand that it is necessary to build up a story around Jane Goodall, she conceded in an early letter

"Nobody will come with a bomb like in the cartoons," he says

The best ones balance fruit and tobacco without letting either take over

However, the observed associations between vaping and subsequent cigarette smoking do not necessarily indicate a causal "gateway effect", as shared social, behavioral, or genetic risk factors may contribute to both behaviors