Rihanna tweets pot picture: Is marijuana use promotion the right example to set?

Rihanna has been making headlines lately for tweeting a picture of herself and her on-again, off-again boyfriend Chris Brown in bed together on New Year's and taking in a basketball game on Christmas. Now she's taking to Instagram to show off her marijuana.

The singer tweeted the above picture with the caption, "This nug look like a skull or am I just.... ?"

Comments from her followers on the post include:

• "As a responsible pop icon... You might think twice about posting something that could encourage kids to try something that is illegal for them."
• "In Cali it's legal and that is where @badgalriri lives so she is good smoke that tree and pass it baby"

A few hours after the pot photo, Rihanna posted the picture below (blurring added), though not necessarily in response to the reactions of her commenters. What do you think? Should Rihanna be setting a better example for her fans?