I'm not sure I have ever seen a petition with this language. If there are more, feel free to post them in the comments. Below is one that was brought to my attention by the National Cannabis Coalition. It has 297 supporters as of this post:
Because every human being born has an endocannabinoid system, a network of receptors exclusively designed to capture cannabinoids and process them. Prohibiting the only source of cannabinoids, Cannabis, aka marijuana et al, prevents this receptor network from functioning. Everyone has this receptor network and everyone should be allowed to supply it.
The Federal Government
Eliminate laws prohibiting the use of the endocannabinoid system.