@ snake
Also when you say chronic marijuana use could that also refer to 'abuse'? Because when abused yes, almost any drug can cause social anxiety.

Use vs Abuse...using a drug is attempting to achieve its desired effect. 'Abuse' is to misuse a drug for something besides its intended purpose.

Not all drugs contribute to 'social anxiety'. Take methamphetamine for example. Although it can cause paranoia and psychosis in consistent amounts, it doesn't necessarily exacerbate 'social anxiety', which is a fancy word for 'shyness' or other social inadequacies.