My doctor won't prescribe my adderall (dextroamphetamine and racemic amphetamine) because i smoke weed. will another doctor write the prescription?

Probably not: Unless you are on marijuana (medical marijuana) for a valid medical condition, no doctor is going to want to prescribe another possible addictive medication . Abuse of drugs, and marijuana is a drug of abuse, raises the concern that you may abuse other high risk drugs such as adderal. No one wants to contribute to a substance abuse disorder.