Hi,
   Thanks for your query. I understand your concern.
    Yes, 
smoking marijunia pot in 
pregnancy has tremendous side effects in fetus & mother both. It may seize 
morning sickness vomiting, but the side effects it causes are hazardous.( name physical / mental/ intellectual / cognitive side effects in new born.. making it's life miserable.
   To control morning sickness you can-
   Chew dry snacks slowly before getting out of bed( water or liquids stimulate vomiting., be in bed for half hour & then get up to start your routine.
     Never starve. Take small/ multiple servings( 5-6 in a day ) of   nutritious food you relish. Avoid spicy, oily or left over food.Avoid aerated drinks,
   _ get prescription from your doctor for preventing morning sickness.( like 
Doxinate pills 2 at bed time )
   - Consult your doctor regularly for pregnancy check up. 
   - Low blood pressure increases sickness.. Some times IV fluids can control such excessive vomiting.
   - Think that it's pregnancy hormones that cause the symptoms.. so your baby is getting good hormones & is growing well. This will stop when your body gets adjusted to the hormones.( usually by 3 months of pregnancy ) It's helpful to be positive.
   Thanks.