Cannabis addiction (and I agree it exists) is not in the same league as opioid addiction.

Heavy smokers may feel different when stopping, may have a few sleepless nights due to dreams returning, may be irritable, feel bored, but it is not at all comparable to those coming off a heavy opioid addiction.

There is no equal disadvantage. If all heroin addicts were to magically over night turn into cannabis addicts and no longer be heroin addicts there will be many advantages and next to no disadvantages. Crime will go down. They will become employable, they will be able to lead "normal" lives. Disadvantages? I am not really thinking of any, let alone any that are equal

Marijuana absolutely can and does cause far more significant withdrawal than just a few sleepless nights. Under certain circumstances, the withdrawal can persist for much, much longer.

It's irresponsible to assume that marijuana is harmless and non-addictive or only mildly addictive, and too easy to justify as being benign, when juxtaposed wth the withdrawal process of harder drugs.

Not really, marijuana withdrawals are fairly tame and many people don't even experiences those. At most, a couple of weeks of irritability, appetite issues, and problems sleeping.

The psychological "withdrawal" can be much worse, but there is a whole range of regular things that can lead to those addictions. And it is often abused to hide other mental health issues, which can flare up while quitting.

You moved the goalposts. My response was to the claim of a "few" sleepless nights, which is far from the truth for the majority of long term regular users who quit. Instead, you said that there are, "at most, a couple weeks of" mild symptoms. This is simply not representative of the withdrawal scenario for long term heavy usage, both in duration and intensity.

I've seen first hand mentally stable folks who quit smoking marijuana after full time use for a number of decades. The withdrawal symptoms in these folks were far from mild, and lasted more than "at most a couple of weeks". Long term insomnia alone is a serious risk factor, due to their dependence on marijuana to maintain a regular sleep schedule.

While your generalization that marijuana withdrawal is tame may be true in many cases, particularly for light or short term use, it is false for long term daily users.

I moved the goalposts to "what our scientific research has found," not to some anecdotal evidence of a particularly bad psychological withdrawal someone you know had. That wasn't the drug's fault, and your friend could have done many innocuous tasks before sleep and had the same problems quitting.

> Point number two: Marijuana is addictive and individuals with marijuana addiction entering voluntary rehab is increasing:(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2797098/)

Most people entering voluntary rehab do so under duress. Specifically, they are doing so as part of a plea bargain, to avoid serving prison time for a drug charge.

The study you pointed to for point number two are ten years old and predate pot being legal in any states at the recreational level.

Additionally those stats are often considered to be enormously skewed as one of the primary ways you can avoid a drug charge in some places is to "voluntarily" enter rehab for it. So while it looks like pot addiction is up, it is really that pot arrests are up.

This would also explain why in the study minorities seem to have a higher rate of "addiction", as they're more than twice as likely to be arrested for minor drug charges and thus more likely to be put in this situation.

   equal disadvantages

Are you suggesting negative effects of marijuana usage are comparable to that of opioids? That really doesn't match any of the research I know of.