This came from another website but it was such a good explanation of the Green Scapular and encouraging story that I'm going to share it with you:

MARY'S GIFT OF THE GREEN SCAPULAR

(taken from http://olrl.org/pray/gscapular.shtml)

The Green Scapular or Scapular of the Immaculate Heart of Mary is, like the

Miraculous Medal, a gift of our Blessed Mother to the Daughters of Charity of St.

Vincent de Paul.

On November 27, 1839, Justine Bisqueyburu, destined by Providence to make known this devotion, entered the Novitiate of the Daughters of Charity, 140 Rue du Bac, Paris.

On January 28,1840, during her first retreat, the young sister was favored with a

celestial vision. Our Lady appeared to her clothed in a long white robe over which

hung a bright blue mantle. In her hands she held her Heart, from the top of which

issued brilliant rays. The same apparition was repeated four or five times during her

novitiate. This favor seemed to have no other end than to increase in the Sister

herself tender devotion to Mary Immaculate.

Clothed with the habit, on September 8, 1840, feast of the Nativity of the Blessed

Virgin, Sister Bisqueyburu was favored during prayer with an apparition of the Mother

of God, who held in her right hand her Heart surrounded by flames, and in her left a

sort of scapular, consisting of a single piece of green cloth suspended from a cord

of the same color. On one side was a picture of the Blessed Virgin as she had shown

herself in the apparitions; on the other, a Heart all inflamed with rays more

brilliant than the sun, and clearer than crystal. This heart pierced with a sword was

surrounded by an oval inscription, surmounted by a cross. The inscription read:

"Immaculate Heart of Mary, pray for us now and at the hour of our death." At the same

time an interior voice revealed to the Sister the meaning of this vision. She

understood that this new Scapular, through the medium of the Sisters of Charity,

would contribute to the conversion of those who have no faith, and above all, procure

for them a happy death, and that it should be distributed with confidence. As the

scapular was distributed, wonderful conversions and some bodily cures were produced.

The Scapular is not the badge of a confraternity but simply a double image attached

to a single piece of cloth and suspended from a cord. The Blessed Virgin declared to

her faithful servant that no special formula of blessing was necessary. It suffices

that it be blessed by a priest and worn by the one for whom it is intended. It may be

placed in the clothing, on the bed, or simply in the room. The only prayer to be

recited is the inscription surrounding the heart on the reverse of the Scapular:

"Immaculate Heart of Mary, pray for us now and at the hour of our death." This should

be repeated daily, if not by the one wearing it, by the one giving it. The Scapular

may be distributed everywhere. Although wonderful graces are attached to it, they are

proportionate to the confidence with which it is given. The Green Scapular was twice

approved by Pope Pius IX, in 1863, and again in 1870 when he said: "Write to these

good Sisters that I authorize them to make and distribute it."

MY EXPERIENCE WITH THE GREEN SCAPULAR OF THE IMMACULATE HEART OF MARY

Rev. Leo Steinbach

When I first came in contact with this devotion, I read an explanation which seemed

to give the impression that it was intended only for lax Christians. I thought it

might be useless for me since I had very little contact with Christians, be they

good, bad or indifferent. My contacts were mostly with Buddhists and Shintoists whom

I was trying to christianize. However I put a few scapulars in my pocket and decided

to try one out. That very day I went to a nearby hospital where I discovered a

non-Christian woman patient who had been unconscious for 10 days previously. The

doctor explained to me that she would very probably die within three days without

regaining consciousness. He and a nurse escorted me to the room. I addressed the sick

woman but she gave no indication whatsoever that she understood a word I was saying.

Thereupon I took a green scapular from my pocket, applied it to her forehead and

repeated the invocation, "Immaculate Heart of Mary, pray for us now and at the hour

of our death."

And what happened? The woman immediately regained consciousness, joined her hands and

very devoutly asked God to forgive her sins. I was amazed. The doctor and the nurse

both non-Christians were also flabbergasted. I immediately instructed and baptized

the dying patient that same day much to her joy. She remained perfectly conscious for

three days more during which time she very devoutly received Holy Viaticum. She

breathed her last while praying to the Immaculate Heart of Mary.

News of this double miracle spread rapidly. People kept asking me for green scapulars

and since I only had a couple dozen which I had received from an army chaplain and

since I had no means of replenishing my supply, I started to lend my remaining

scapulars with a proviso that they be returned after three days. I did this in order

to help as many people as possible. Meanwhile a Catholic newspaper reporter helped me

procure the necessary materials and we began making them. During the past 25 years we

have made and distributed many tens of thousands to people living all over Japan. We

have also sent quite a number to the United States, Brazil, Paraguay, Korea and

Indonesia. A Catholic magazine here in Japan published an explanation of the green

scapular about a year ago and we have been receiving requests daily ever since. On

one single day we received 140 letters and we try to fulfill each request promptly.

We never charge for them nor do we ask for postage. However we have never been in

debt. Grateful people send us donations which cover the cost of materials and

postage.

It is edifying to read the letters of gratitude. Many people report spiritual

blessings and there have been miraculous cures too of almost every type of human

ailment including blindness, deafness, cancer, tuberculosis, high blood pressure,

rheumatism, arthritis etc. Luke-warm Catholics and non-Catholics seem to receive more

favors than good practicing Catholics.

An 80-year-old non-Christian lady said she would like to visit the church in her

vicinity but she was unable to walk because of arthritis. Every winter both her

ankles and wrists were swollen and very painful. She was given a green scapular which

she applied daily but since she could not remember the prayer she merely asked the

Mother of Christ for help. Within a few days she was completely cured. After a brief

instruction and Baptism, she attended mass daily and always received Holy Communion.

She kept up this habit for two years until she was called to her reward. During this

interval she converted her aged friend who lived just across the street from her home

and she had the happiness of being her godmother. Her good husband, a staunch

Shintoist, also treasured his green scapular but no one could induce him to become a

Christian. However, just three days before he died, he had a change of heart. He died

very happily after receiving the sacraments.

The owner of a fleet of 60 taxis in Kyoto asked his pastor to bless his vehicles on

New Year's Day, whereupon he presented each of his drivers a new green scapular. He

encouraged them, although they are non-Christians, to recite the prayer at least once

a day. During the year there were just a few bent fenders but there were no accidents

that caused a personal injury. The Blessed Mother is never invoked in vain. Her

prayers are powerful. Japanese "kamikaze" drivers moving at a high speed in all kinds

of weather, day and night, are very grateful to their Protectress.