Hello Claire,A strong green color vomiting is indicative of bile (gall bladder juice). It is not likely to be serious if you do not have any other symptoms, like significant abdominal pain, tenderness of abdomen, bloating, gas, significant heartburn, and severe constipation. The reason is likely to be combination of taking two birth control pills and withdrawal of weed. The bile usually is secreted in the small intestine but may come in stomach and irritate it. This induces the vomiting and likely to be due to the two causes we discussed above.If you have any other symptoms, you may consider going to your primary care physician. Otherwise you may wait and watch. Meanwhile you may take Dramamine and PeptoBismol (both are available without prescription).Please feel free for your follow up questions.
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