WATCH: Justin Bieber opens up about past drug abuse

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This article may contain graphic and/or adult content unsuitable for minors and sensitive readers.

Bingeing on ecstasy and hallucinogenic mushrooms, swallowing handfuls of pills as soon as he woke up - this was once how Justin Bieber made it through the day.

In the latest episode of his YouTube series Justin Bieber: Seasons, he gives a candid account of his dark journey into the world of addiction admitting that it got so bad "security would check my pulse through the night'.

Watch the episode titled The Dark Season right here. Incidentally, as of the 2nd February, Justin Bieber has 50 million YouTube followers.