There isn't a clear and proven study on the effects of marijuana on varicose veins but it was seen in one study that there was a 33% incidence in men with side effects of marijuana developing varicose veins. It is an incomplete study so it's difficult to comment on it. But I would advise you to quit smoking in general since you've already developed problems at an early age so it would be best to avoid it.
Next Steps
Follow the steps as advised
Health Tips
If condition persists or worsens visit the general surgeon at the earliest