There are not enough facts here to make any reasoned predictions. "Addicted to weed" is probably hard to prove, as it is considered not particularly addictive, and is now legal. LSD is more serious, as it is not a lawful drug. You don't specify what grounds he might have to "take my son away from me." You might want to review the factors a judge looks to in mkaing a custody decision, which are listed and explained here. Beyond that, it is probably best for you to consult with a family law specialist.
Answered on Aug 14th, 2020 at 2:41 PM