@ King Jam
What you said is very true, but I have a few things to add.
Many of the things we do that are "religious" are tools. Meditation is a tool. Smoking the herb is therefore using a tool. For what?
To get your mind into a more meditative state from which you can gain more insight, revelation, etc. You can get into this state without any tools and many people do. You can also get in this state depending on how you sleep. Some people stop using the tool because they see it as a crutch to them being able to go in and out of this state at will.
However, many people mostly smoke out of habit and out of comfort and to help with pain management, tension, and stress. There's nothing spiritual about these things. Their value is mostly physical. It is simply that the physical/literal often gets in the way of the spiritual. So being able to quiet the body helps with the mind.
Many religious practices simply reinforce an idea. Many people need help with these ideas and so the reinforcement helps them. But this too is a tool; no different from the teacher giving you homework at school so you can keep practicing so that your brain is more easily able to apply that principle. Reinforcement is also about memory. That's why the bible says "Remember the sabbath day to keep it holy" Repitition clearly enables better memory retention like repeated weight lifting helps build your muscles. But is it spiritual in and of itself? No.
Religions cannot make people spiritual. They can only create a path that increases the conditions in which spirituality can develop. And when a person does graduate into the spiritual they may naturally not see a need to continue the religious practices that may or may not have helped to get them there. I could say more but when it comes to spirituality it is a personal journey and what one says can become a stumbling block for others.