Well matter of opinion. I would not want any druggies watching my back. As soon as you start being "tolerant" you'll open a Pandoras Box. I started to see druggies in the British Army in the early 90s. Wasters. One drove a 432 AFV into a German car & another was attached to an infantry Battalion in Northern Ireland, they cought him Smoking Dope in the Ops room on Radio Stag at night. No place in the military in my opinion.