Ehm where is there any evidence for that? ^
Please provide it or stop selling false information based on rumors or a bad trip.
On-topic: I have never seen a 3D movie sober since I only went to Avatar 3D once on 2C-C and it was excellent. Very fluorescent colors and beautifully sensitive mood, the stuff is pretty mild and easygoing but I didn't want to go full-on tripping in a movie theater filled with people I don't know (except for my friends).