I can’t comment on the first- I know many people use cannabis before, during, or after workouts and that suits them- but it is not optimal for gains or other factors.
To the second, if you have lower back pain after deadlifts and it isn’t your first time or you haven’t been away for awhile- you’re probably doing something wrong or have an injury. Some soreness in the muscles is often normal- but back pain shouldn’t be normal after deadlifts- especially right after.
Lastly- DOMS is a contested topic to begin with, let alone training philosophies that conflict on wether soreness is a sign of a “good workout” or a sign of a poorly designed and executed routine. But to some degree you can expect some mild soreness when beginning a new physical activity- although again- it is entirely possible to train in such a way that you do not get sore or have effectively no soreness.
Whatever works for the individual- with hopes that they are at least being healthy and training in a sustainable and sensible manner for their goals and needs. The knee pain thing just sucks.
To the second, if you have lower back pain after deadlifts and it isn’t your first time or you haven’t been away for awhile- you’re probably doing something wrong or have an injury. Some soreness in the muscles is often normal- but back pain shouldn’t be normal after deadlifts- especially right after.
Lastly- DOMS is a contested topic to begin with, let alone training philosophies that conflict on wether soreness is a sign of a “good workout” or a sign of a poorly designed and executed routine. But to some degree you can expect some mild soreness when beginning a new physical activity- although again- it is entirely possible to train in such a way that you do not get sore or have effectively no soreness.