I'm not trying to undermine your point entirely, but there is a flip side.

I can't tell you how many times I have seen a patient start a medication, then come back to the office within 48 hours because they coincidentally have every side effect that is listed in the pharmacy's information sheet or that they looked up online. The vast majority of these side effects are benign, present with next to no pertinent physical exam findings, and can't be definitively tied to the new med (like upset stomach, fatigue, headache, etc.).

Then they will start listing that medication as one of their "allergies", and if the nurse/doctor documenting doesn't dutifully probe what type of "allergic reaction" they had, they may end up not being prescribed that med in the future when it really is the drug of choice. A little nausea is a small price to pay if it kills a potentially life-threatening infection.

Also, I'm skeptical about the seizure risk. The thing about side effects is that they are supposed to be stratified according to risk. Doctors are typically aware of these risks, but patients aren't. So if your drug is listed as causing "headache, nausea, and seizures", there may have only been one patient out of millions who had a seizure while 50% experienced headache, yet the handout probably won't tell you that.

But even if it is a notable risk, I would be surprised if the propylene glycol you inhale from an e-cig could accumulate to a high enough level in the bloodstream to cause drug interactions, although I admit adequate research on the subject is lacking.

My advice would be trust your doctor first. If you don't trust your doctor, start seeing a doctor that you do trust. Then if you have a significant adverse reaction to a medication, talk to your doctor about it. Quite often they know something that you are not going to find by spending a few minutes on the internet.

As a side note, a good history includes asking about many habits. A lot of healthcare providers are guilty of simply asking "Do you smoke, drink, or use drugs?", but ideally the smoking aspect should be phrased as "Do you use any tobacco or nicotine products?". Patients usually won't read your mind and volunteer that kind of information. They will tend to give yes/no answers, so direct and specific questions are important.

Odd, here in Norway that's exactly the kind of information I expect to see on a leaflet inside the packet, not only on prescription drugs but also over the counter pain killers like paracetamol. Roughly translated from the Norwegian it says:

Rare side effects (more than one in ten thousand but fewer than one in one thousand patients) include: over sensitivity, allergic skin reaction/rash, reduced white blood count, anaemia, disturbed liver function. Very rare side effects include serious skin reactions. Liver function can be affected by paracetamol and alcohol abuse.

That seems like a major problem. Is there any reason that more detailed information can't be included? Mathematical literacy may be a problem, but that doesn't mean that there aren't millions upon millions of mathematically and scientifically literate consumers who could use this information effectively.

I'm not trying to justify any of this, but that's how it is.

Not sure if it will be helpful in the future, but I can tell you that descriptors used with side effects follow a standard convention:

    very common: > 10% 
    common: 1%-10%
    uncommon: 0.1% - 1% 
    rare: 0.01% - 0.1% 
    very rare: < 0.01%

Once you view your GP as a mechanic, you can make much better decisions. Sure, their "cars" are more complex, but the role they play is similar. If you want your body to function well, you are responsible for it, not the doctors. They just help you out.

The system is built on rent seeking behavior. If I don't treat it immediately then the patient will come back again and I can charge him/her a subscription.

Health care in America is very inefficient. Mostly because of insurance lobbying and govt that can't make a firm long term decision.

I would love to see most common problems be self diagniosable with kits and AI.