"Puff, the Magic Dragon" was a hit single in 1963 for which of these musical acts?

Mary Travers was horrified when she found out people were saying Puff is about marijuana. She was appaled anyone would think they had released a kid's song about drugs.

I remember being taught this at primary school.

People can read anything into a completely innocent song, story play etc.

Pardon my ignorance but, doesn't "puff the magic dragon" suggest use of opium? (@WeeverBeezle)