Smoking anything is bad for your lungs.
Ingesting it in other forms it’s like most chemicals, when used in moderation it will probably not lead to any long term adverse effects, although there is some evidence it can worsen existing mental illnesses. Heavy use can lead to an impact on cognitive abilities, especially when you’re adolescent and your brain is still developing.
Anecdotally, I’ve seen multiple heavy cannabis users decline as they grew more dependent on it, similarly to heavy drinkers. It was like their IQ just dropped.
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