“Rocky mountain high” is a common phrase in Denver, CO but that transient high so sought after by pot-smokers may be doing long-term harm to their brains. ┬áResearchers in Switzerland track the marijuana use of 3,400 users over 25 years and tested them on memory, mental processing speed and executive function. ┬áThe results are concerning. For each five years of pot use, 50% of smokers remembered one fewer of fifteen words from a numbered list. ┬áThat may seem like a small difference, but it is significant and may indicate direct toxic effects to neurons.