Cannabis Plant and Yoga - Thoughts?

I have a question.

In Hinduism, meditation is connected to the deity Shiva, and in the mythology and scripture, he is connected with meditation, yoga and cannabis plant. In some other scriptures, cannabis plant is said to be sacred. Sadhus (ascetics/monks) often smoke cannabis plant.

Yet, other scriptures and people say we should be very careful with weed and it isn't recommended for yoga and meditation. What do you think?