It represents the greatness of the lord Shiva, who saved the entire world by consuming the deadly cosmic poison. The most mesmerizing thing about Shiva is that he is renowned for his benevolence and simplicity. People have strong faith in Shiva.
In fact, an enormous amount of devotion emerges for lord Shiva. Devotees seek strength, courage, knowledge, and prosperity from Shiva. Because of that devotion, people offer toxic substances to Shiva, and it has a spiritual meaning which is defined below.
For devotees, offering weed to Shiva has a symbolic meaning. By doing that, you are offering your evil side to Shiva and praying.
“Dear lord Shiva. I offer all my intoxication and bad karma to you. You are the destroyer of all sin and purifier of mind and body. Please make me free from my past sins like you freed the entire world from the cosmic poison, Halahal.”
It is a constant feeling that offering these substances to Shiva means getting purified from your sins and promising Shiva that you will choose the path of righteousness in life.
It is the reason lord Shiva is seen holding chillum in most of the artwork.
Lord Shiva never endorsed the consumption of any tamasic food & drink substances; In fact, it is against Shaivism. Even Shiva’s true devotees will never intentionally eat meat because they know Shiva is Pashupatinath, the lover of animals.
When Bhang is served at the festival of Mahashivratri, it has other intentions than intoxication. Most people don’t know that Bhang has a close relationship with Ayurveda. (Science of Vedic healthcare)
There are many benefits of Bhang intake. According to Ayurveda, bhang is beneficial if consumed at a limited base. Excessive use of bhang can be injurious to health.