Cody Simpson -- Let Me Be Blunt ... I Smoke Weed

Cody Simpson just proved he is like most 18-year-olds ... the dude likes to light up.

The singer uploaded a photo Wednesday showcasing a stash of joints, enhancing it with a palm tree.

Simpson almost immediately deleted the pic but then left a big clue. He started posting pics from inside a music studio, so something tells us he was trying to get in his creative zone.

Simpson has a squeaky clean image and the photo set off a red alert to his teen fans. One tweeted "DON'T SMOKE WEED!!!!!".

Here's the reality. In 2015 if all you do is smoke weed you're still kinda squeaky clean, right?