Hello, Thanks for choosing health care magic for posting your query. I have gone through your question in detail and I can understand what you are going through. The effect of inhaled drug mostly lasts for a few days only. Mostly 2-3 days. The symptoms should settle down by then. In certain cases the drug my cause anxiety symptoms which may take a few weeks. There is no need to worry about the brain damage as one single exposure will not lead to such extensive damage to the brain. No specific treatment required, you just have to abstain from taking any further substance/drugs. Hope I am able to answer your concerns. If you have any further query, I would be glad to help you. In future if you wish to contact me directly, you can use the below mentioned link: bit.ly/dr-srikanth-reddy Wish you good health, Kind regards Dr. Srikanth Reddy M.D.