You need to weigh up the pros and cons...are the benefits ($60-$120 per week?) of dealing an ounce or two going to outweigh getting caught, ruining your education and life and possibly going to some sort of detention centre? I would guess not...
BUT As with selling anything, you need a network of people who want to buy what you're selling; it sounds like you haven't got this or you wouldn't be struggling to get the word around. Mentioning the fact you have weed to sell to good friends (and thus their friends) probably won't get you caught, but, as you mention, you run the risk of others mouthing off and dropping you in the shite.