Not to mention that it does have some wholly legitimate medical uses, and is far less dangerous than alcohol or tobacco....
Overall I’m really not certain what the rational justification is for keeping it illegal.
Depends on the person.
We all know alcohol impacts people differently, and all know chain smokers, 20 a day, all their life, living into their 90s.
As there are people who are mentally oppsed up through smoking a bit too much weed.
That is not chain smoking TB. 60-80 per day is the measure of true chain smoking. One of our past company directors smoked at least 60 Capstan Full Strength per day; he was already down to one lung in his 50's, and breathless most of the time retiring early.
One of my uncles, along with my auntie chain smoked to the tune of 80 each per day, being used to duty free cigs when in the Royal Navy. He lost both legs, and like her died in their late 50's.
I could go on with other family examples with those who smoked constantly when it was once socially acceptable, and "so good for your health" (!!!) to do so, and although I worked in a retail company selling the bloody stuff, but never smoking it myself, I have always wanted to ban tobacco products.
But that would do no good, no more than the current criminalisation of smoking cannibis. Cannibis (directly or indirectly) tobacco and alcohol all kills or shortens life in the long run, so let the government control cannibis use as it does the rest, produce revenue, and gradually reduce consumption as it has with tobacco and alcohol (yes figures are showing that there has been a drop in youngsters consumption) ,along with an overall decline in public houses. Then the police can target other criminal activity, which often is funded by cannibis production and supply, including the supply and use of class 'A' drugs.