If ive been smoking weed constantly will that show up in a tb skin test? because ive heard its only injected drugs that can be detected but other sources say drug abuse can be detected?

Misinformed. TB skin test detects whether or not you were exposed to TB or are having active disease.

In my state & many others it is not legal to test for drugs unless it is an employment or other physical where you have given written permission for screening tests. TB skin tests do not have any capability other than pick up a person exposed to or who has active TB.

Weed use would not be detectable with a TB skin test. Having said that, Marijuana is a psychoactive drug and will mess with your brain. MJ users are called stoners for good reason. Quit using it while you are ahead. Wish you good health!