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it should be entirely possible to get an effect by smoking adderall the way you would other drugs, in theory, but its very unlikely you can actually do it in practice. the smoke from pills is absolutely noxious; and mostly nonpsychoactive. you have to inhale more smoke/vapor or nasty stuff than of the actual drugs you're looking for, and it will likely be so harsh you can't stand to hit it more than a couple times. not enough for a whole pill, let alone if you'd want two or three.
meth that people smoke is not necessarily in freebase form, either. in fact, most drugs that are smoked ARE NOT freebases, including chemicals. the only two chemicals that need to be freebases in order to be smoked, as far as i know, are cocaine and DPT. there are a large number of other smokable drugs which are not freebases.
it would stand to reason that dextro- and levoamphetamines would be active when smoked, and i've heard of people smoking adderall and even ritalin though its not at all common, but when they come prepared in pills (which are mostly things like chalk and wax and colorings and other shit, and very little speed) they are not really fit for smoking. it would be better if you could isolate the drugs and just smoke that part like any other chemical drug, but still it would be quite terrible for you.
amphetamines are bad enough for you orally or when insufflated; don't go trying to smoke them or inject them, too....