In a healthy mind, there is a causal hierarchy: Reality > your perception of reality > emotions (strongly simplified!). You are suggesting that stoicism means manipulating emotions, at the bottom of the hierarchy. What (to me) it means is manipulating the perception of reality. I agree that shoving aside emotions won’t do you much good, except in the short term (e.g. not punching the boss in the face). Long term emotion suppression will make you depressed. Stoicism doesn’t tell you that you must not be angry. It tells you that your boss is actually not in control of the situation herself, and also does not control your own destiny - her bad decision is suddenly only an annoyance, and not a life-threatening event. And your emotions will adjust accordingly.
Vaping nicotine 20 times a day is obviously a bad idea and might lead to cancer. Vaping 2 draws of CBD (a non-addictive substance) 2-3 times per week might also have a negative long term effect, but I’ll take it. I don’t use propylene glycol, but only vegetable glycerine to minimize risk.