Be carefull though, even though it's not chemecally addictive (at least the 2 people around me who used to smoke everyday successfully stopped within a two-week period without difficulties), there are some unknowns around cannabis effect when mixed with tobbacco. If you're already at risk for heart issues (genetics, overweight, male, black), you'll want to slow down consomption (cake, pure pot seems to be still okay). Also, like psychotrops or anything that numb your sensations or slow your brain (alcool, keta, fenta), it might have an effect on developing brains, so don't take too much until you're 24-25. Again, studies are pending (the war on drugs really killed of research at some point).

That said, it is a valid brainhack for anxious people from my experience.