Yes.
I inject my brisket with a beef broth mixture. Thats really the only one.
Ive injected pork shoulder with a different mix, find its not necessary.
I dont marinate meats that I low and slow smoke.
Although Ive done tri-tip that were injected and marinated on put on a couple hour higher temp smoke that came out very nice, but I can make it just as good other ways without the work.
Otherwise I'm simply not a marinade guy anyway. If Im cooking good steaks (Ribeyes, strips, filets) you are a heretic if you marinate them.
Flank and skirt and such take maridades fantastic, and always marinate them, but those are hot and fast cooks. You could experiment with injection, but not really necessary either.