Drinking alcohol and using marijuana at the same time. Interestingly, alcohol seems to increase the level of THC, given that if you divide people who smoke the same kind of weed into two groups, and one of the groups also consumes alcohol, the alcohol group will have a higher blood level of THC. However, given the possible dangerous nature of crossfading, some people in the cannabis biz suggest that if you are going to do it, do just a little of one, then a little of the other, until you feel good but are not fucked up. 2.) Crossfade is a band from South Carolina founded in the 1990s. It had a couple of different names before they settled on Crossfade.