Marijuana won’t have any effect on how the abortion pill works, so you should be safe to smoke cannabis the day before you take it.
However, you might want to keep in mind that marijuana can stunt the growth of an unborn child, so if you decide not to take the abortion pill, you’ll want to refrain from smoking weed.
Complications from smoking marijuana whilst pregnant include:
Increased risk of leukemia
Low birth weight
Risk of lower IQ
Poor memory and concentration
Dependency
Scientific tests have shown that nearly all of the marijuana that you smoke whilst pregnant will reach the baby, so you'll be affecting your unborn child just as much as you'll be affecting yourself.