The myth that smoking marijuana with tobacco will make users more stoned has been debunked by scientists.
Cannabis users across the world have long believed that sprinkling a handful of tobacco in with the herb improves the high.
But in the first study of its kind, researchers delving into how both substances interacted when inhaled together found no such effects.
However, they did note that mixing the two together may help to lessen the memory impairment caused by smoking cannabis.
The new University College London research suggested this could be because nicotine has previously been proven to sharpen the mind.
As legalisation of cannabis becomes prevalent, researchers said it is essential that any changes in its policy consider the interrelationship between tobacco and marijuana.