What Are The Side Effects Of Depo Provera Injection?

Hello,

I'm taking depo-provera and so far have no bad side effects. Though I do have a question.

I have 8 roommates who smoke cigarettes and pot.They go outside to smoke cigs,but sit inside to smoke pot.My recent doctor told me the smoke could trigger some bad side effects. What could happen as far as side effects?

Thanks for your time