what's up doc?lol,well i know for a fact that E sometimes causes depression as one of its side effects but some of my friends completely love it and feel its a wonder drug but i think i'll just stick to weed and hash and as for ur highs not last as long thats also very normal cos the more u smoke as u said the greater ur tolerance for the drug grows so just smoke larger quantities fewer times for better highs and if that doesnt work u could probably swith to your E ...hope u enjoy the expirience of trying out a new drug