Thrush is a type of yeast and is called candida. If you have thrush in your mouth do not use the same toothbrush because it will continue to reinfect you, if you can't afford a new toothbrush everyday you can pour boiling water on it and rinse in cool water before using it everyday. Thrush is common if you are using some kinds of antibiotics or if your immune system is compromised/deficient. You may want to see your physician.
No thrush is a yeast infection
It is not caused by smoking weed but you can contract it if you were sharing the joint with someone who had thrush and was smoking the same joint also.
No, thrush is not caused by smoking weed. It is caused by eating any kind of food soon after smoking weed.