First of all, if what your trying to do is to help, your doing a pretty terrible job of going about it.
Secondly - the only information you have that corroborates your claims is completely anecdotal evidence from someone who you claim is a doctor.
Now where I have a problem with this is that you seem to think that being a doctor immediately gives you an infallible encyclopaedic knowledge of everything related to anything regarding health and the human body. I have no doubt your doctor told you weed is carcinogenic. Just like when London was rife with Cholera, the doctors told people that it was caused by bad smells; and they believed it - because they are the doctors, right?
Nope, poison water. Who'd have thought? Actually quite a lot of people - most of whom had their images and livelihoods ruined by aggressive doctors who didn't want to be proved wrong.
The medical system is not based upon making you feel better. It's based off of making as much money, as fast as possible. Which means they want you to ignore the cheap, natural cures that solve many of the issues you will face in life and take their value added services instead. People are curing cancer with cannabis, not the other way around. And that is why your doctor is looking you in the eyes and telling you an un-truth, because it's his bottom line at stake. There is so much evidence that you are simply ignoring in the face of a simple, singular answer from one doctor.
And don't expect anyone to have the right answer, one way or another. Part of the way adult life works is that your supposed to survey the evidence yourself and make an educated decision based on the fact. If there was an right answer, then society would know it by now, no? Wouldn't marijuana already be widely considered just as bad as cigarettes if the medical industry could prove it's harm?
Now if you can show me some good evidence support your claims (i.e. not anectdotal) then I will listen. I will take you seriously. Until then, you just keep doing what your doing and see if that has the effect you intended.