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The only way to make mdma more intense is to stop taking it for awhile. If you've been rolling once or twice a week for a year, thats really bad for you. I'm suprised you haven't noticed any negative effects from it. But yea to make it more intense you got two options : Take more ( which is not a good idea ) or to stop for a few months. You should ask yourself why you need to roll so much? MDMA should only be experienced a few times a year imo. Otherwise it loses its magic, so you should stop now so the magic can come back.
"When you can stop, you don't want to. When you want to stop, you can't. "